Fuel Gauge Reads Wronf After Replacing Sending Unit

08-16-200807:40 AM

I put a new fuel pump in.

When I showtime turned the car on information technology seemed fine. Then it went down to Eastward from 3/4 in similar 120 miles.

I went and filed upwards the motorcar. It took 9.eight gallons which isn't plenty to put it all the style as low as it was reading and after I filled information technology all upward it only went back to 3/4 full and saying 290 miles to proceed the tank.

It should exist full and reading effectually 450 to the tank.

Any suggestions or ideas?

Should I unplug the battery and try to reset things?

The battery was unplugged for about a week while the motorcar was down for the fuel pump and I was waiting for parts.

08-sixteen-200809:31 AM

does the pump float up and downwardly? i didnt have whatsoever trouble with my reading later installing my replacement

08-xvi-200810:48 AM

What do you mean float? Information technology was turned and locked into place.

I really don't feel similar opening the damn affair back up.

08-16-200811:45 AM

You must accept hit the float(level) arm that measures how much fuel is in the tank.

08-16-200811:52 AM

Quote Originally Posted by mike-2ptzero View Post

You must have hit the bladder(level) arm that measures how much fuel is in the tank.

Isn't that called the sending unit or is that something dissimilar?

08-16-200812:46 PM

Quote Originally Posted past mike-2ptzero View Post

You must take hit the bladder(level) arm that measures how much fuel is in the tank.

Where is that?

Is that part of the whole sending unit piece that I changed?

I don't see annihilation about it in the Bentley Manual.

08-16-200805:xviii PM

Quote Originally Posted past Stockton View Post

Where is that?

Is that part of the whole sending unit slice that I changed?

I don't run across annihilation about it in the Bentley Manual.

Did you change out the pump or the sending unit of measurement?

08-sixteen-200805:twenty PM

Quote Originally Posted past mike-2ptzero View Post

Did y'all modify out the pump or the sending unit of measurement?

What is the departure?

08-sixteen-200805:42 PM

You lot simply replaced the pump that sits inside of its ain housing. The fuel level unit of measurement is also in the tank and my approximate is that the #2 electrical plug in the 2nd picture of the instructions goes to the level unit.

08-sixteen-200805:58 PM

The tanks used in the quattro's ahve two level sending units. 1 mounted onto the pump basket with the electrical connector plugging into the pump flange cover (the tank cap thing that the fuel lines and electrical connectors plug into). The other level sender is on the driver side of the tank.
Sounds like you lot probably forgot to plug in the rider side level sender. When you removed the tank cover to access the pump mounting handbasket, yous probably pulled the extra connector off since the two minor wires are kinda brusk. So without realising it, yous probably reassembled everything without realising the level sender was not plugged back into the tank cover/flange.

C

08-16-200806:00 PM

So you mean this wire that came out of the gas tank is continued to the level unit?

I assumed this too and wasn't sure which way it went back on. It connect either style and I couldn't remember how it came off.

Could it but exist on backwards? At start information technology seemed fine saying I had about iii/4 tank later on I replaced the pump which was right merely after a few days I noticed the reading being off.

If the leveling unit of measurement isn't correct how do I fix that?

08-xvi-200807:07 PM

Not sure. Its either the sending unit of measurement or the equalizing pump. Only way to know is to expect it upwards.

08-xvi-200807:18 PM

Look it upward how? That'due south why I'm here asking.

I have a few days to use some gas upward since I only filled it before I open up it support.

Now that I've done it, it'southward a 10 minute chore to get dorsum to simply I merely don't know what I'll be looking for nonetheless.

08-17-200803:57 AM

Quote Originally Posted by Stockton View Post

And so you hateful this wire that came out of the gas tank is connected to the level unit of measurement?

I assumed this too and wasn't certain which fashion it went back on. It connect either way and I couldn't remember how it came off.

Could it just be on backwards? At first it seemed fine saying I had about three/4 tank after I replaced the pump which was right but afterwards a few days I noticed the reading existence off.

If the leveling unit isn't correct how do I fix that?

Yup, that'southward the plug for the level sender. It doesn't matter how it's hooked up since it doesn't relley matter which direction the current flows through the level sender.

I approximate I misread or misunderstood your original post. So I kinda jumped to conclusions I approximate.
The level sender clips onto the side of the pump handbasket. Side equally in the side towards the front of the car. If you use one of those modest mirrors, you'll be able to see the retaining clip which keeps information technology in identify in example you need to remove it.
Anywho, I don't know the specs off paw, I'll run into if I can find or if they're avaialble on dominicus (subsequently today actually), but what you want to exercise to exam the level sender is to hook upwards a OHM Meter to the ii terminals of that connector you take pictured and pull it all the way up and slowly push it all the manner down and you should get a nice steady change on the resistance values on the OHM Meter. Like I said, I'll find the minimum and maximum specs for y'all. Do this when you get some of that gas used upwardly and open the tank once again. Obviously you also wana inspect the level sender visually also for any damage, in case information technology got damaged somehow while getting in in that location. You'll know what you're looking at when you meet the metal rod with the floating affair hanging on the terminate of it pointing towards the commuter side of the automobile.

C

08-17-200810:20 AM

This might aid you out. A4,S4 "erratic fuel gauge repair" DIY:

http://www.audiworld.com/tech/elec.html
Good luck!

08-17-200811:11 AM

Quote Originally Posted past FourRings80 View Post

Here is the link to the actual article

08-17-200807:thirteen PM

Adept Article there. Though the level senders for B6'southward are a little different and don't accept that little cheese whiz wire. The article will yet be a good reference. I was looking through some info and have not been able to find any specific specs for the level sender. VW Audi kinda sucks that style when it comes to testing and inspection specs as they often will only provide testing specs under mistake code diagnosis. And I'grand not nearly aggressive enough to sift through mistake code charts to at the moment. Though, I exercise take a level sender I took off a not quattro B6 a while back and it'southward range is about 55 to 305 OHM'south. And non long ago I had to bank check a P-Machine boxster and information technology also had a range of 40 - 280 every bit mentioned in the commodity. Basicly these things are a fairly standardised (is that even a existent word,....lol) matter, and so you should be right within those numbers, requite or accept.
There is no transfer pump in this tank, only siphoning tubes so along. And I as well establish a Technical service bulletin (TSB) about the commuter side level sender causing the an inaccurate fuel gauge brandish. The TSB makes mention of the certain production dates of the commuter side level sender printed on a small tag which should be visible when removing the drivers admission cover (the 1 with the three screws). If it's made on or before the 311th day of 2003 (311/03), so supervene upon it regardless. If it's fabricated on or subsequently the 312th day of 2003, then information technology should be fine, though it should be checked regardless. This would also make more sense when compared to the result of the older B5 units with the cleaved wire every bit the gauge would typically bounce effectually and drop dead like around tight turns equally oppossed to just beingness inaccurate. The car existence an 04 would about likely mean it has the known faulty sender in it.

I also got to thinking. A couple of days agone I put a pump into an 03 quattro and remembered that little black tube with the two 90 caste bends in it was a little bugger to go on from getting hung upwardly on stuff. May wana simply double bank check to make sure it's not interfeering with anything similar the level sender and that the siphoning tubes within the tank did not get disturbed/damaged somehow. Then obvioulsly prudent to bank check the production appointment on the commuter side sender. maybe just weird coincedence that it finally strted causing problems.

Promise this helps

C

08-17-200807:42 PM

I remember when my dealer changed mine, they changed the fuel sender too.

08-eighteen-2008ten:17 PM

Cool thanks for the helpful info everyone.

When I go the gas downward I'll open it support. We've been under a hurricane/tropical tempest alarm today and tomorrow and I don't drive much equally it is and then information technology'due south taking some fourth dimension using this fuel up and I just cleaned all the spilled gas out of my garage then I don't feel similar doing that once more.

I have one of those footling telescoping mirror things so I'll take a await in there when I can.

I but don't think I tin get the fuel pump out again cause I sold the specaility tool for it. If I can't get this fuel approximate stock-still I'm merely gunna sell the car.

08-18-200810:55 PM

BINGO!!! Stockton I bought the tool just for that. The shop that installed my 034 pump forgot to plug that harness in and I was having the very aforementioned issue.

Quote Originally Posted by Affinitive View Post

The tanks used in the quattro's ahve two level sending units. 1 mounted onto the pump basket with the electrical connector plugging into the pump flange cover (the tank cap matter that the fuel lines and electrical connectors plug into). The other level sender is on the driver side of the tank.
Sounds like you probably forgot to plug in the passenger side level sender. When you removed the tank cover to admission the pump mounting basket, yous probably pulled the extra connector off since the 2 small wires are kinda brusk. And so without realising information technology, yous probably reassembled everything without realising the level sender was not plugged back into the tank cover/flange.

C

08-18-200811:13 PM

your what pump?

034 as in 034 motorsport? or was that a typo and you have that "upgraded" bosch pump which i thought didnt fit?

or is it the "040" pump which is supposedly a shorter pump with near 044 capacity, and which is available through 034. lol

that's fvcking disruptive hahaha

08-xix-200809:33 AM

I upgraded to the "040" pump made by 034 Motorsports.

Quote Originally Posted by B6Lovin View Post

your what pump?

034 equally in 034 motorsport? or was that a typo and you have that "upgraded" bosch pump which i thought didnt fit?

or is it the "040" pump which is supposedly a shorter pump with about 044 chapters, and which is bachelor through 034. lol

that's fvcking confusing hahaha

08-nineteen-200810:22 AM

Quote Originally Posted past HIERLEVELZ View Post

BINGO!!! Stockton I bought the tool only for that. The store that installed my 034 pump forgot to plug that harness in and I was having the very same effect.

And so what harness did they forget? The one I take pictured above that I'grand holding?

08-xix-200804:02 PM

Quote Originally Posted by Stockton View Post

So what harness did they forget? The one I accept pictured above that I'm holding?

Aye that'southward the one!

08-19-200806:37 PM

so the 040 pump from 034 IS a direct fit in our cars, and has no issues equally far as fitment?

08-26-200804:06 PM

Ok well I finally got the gas down and opened it back up. I saw the bladder lever arm now. On the original install I had a full tank so in that location was to much gas to see effectually in there.

It works perfect at present. All I did was pretty much jiggle everything around, haha.

I pulled the float lever arm upwards and pressed it downwards gently so it went through the full range of motion, jiggled the pump in the housing to make certain it was seated nicely and if anything was defenseless maybe free it up.

I did disconnect this wire and flip it around cause it'll connect either way so I tried it going the other way.

Now information technology'southward all good.

05-08-200901:42 PM

Post - reincarnation.

I am having the same issue in my 04 Quattro.
I see that this is a known effect for Audi, are they correcting it nether some form of warranty, or not?
I have an 04 with but 43k miles

06-22-200911:03 PM

guess i just joined the club, 04 quattro with new fuel pump and erratic fuel readings
going to run down the gas and endeavour a fix this weekend

cheers for posting the info

02-22-201009:11 AM

Quote Originally Posted past Toast View Post

guess i but joined the club, 04 quattro with new fuel pump and erratic fuel readings
going to run down the gas and endeavour a fix this weekend

thanks for posting the info

Dito, I have the same Vehicle as the OP, and the aforementioned problem. Looking into opening her upwardly this evening. My outcome is why am I smelling fuel upon start-up/warm-up? The fuel pump is literally under 3K mi new. Anyone take the aforementioned issue (smelling fuel)? or does anyone know if that issue is correlated?

02-22-201009:20 AM

i didnt accept a trouble with my change.....merely on full mine says 300 miles.....

03-19-201003:39 PM

any pics of the "float level arm"? im having this aforementioned issue. i was at "1/4 tank" and just filled up with just 6.ix gallons. usually its thirteen.

05-12-201302:fifteen PM

Hi, I am new to this forum and non certain how to work them, i am looking for some help/ suggest on a problem i have on my a4 b6 1.8t quattro. I take just bought the car and the fuel gauge seems to show empty on the fuel gauge (when total) and full when empty!!!??? i take tried the method of uplugging fuses fifteen and 28 every bit i take seen in another post but this didnt work (not certain if information technology was the aforementioned problem)

Any aid is profoundly received as i am a total on NOOB! :)

Thanks!!

05-12-201304:51 PM

I realize that this is a three year quondam thread but since it has been reactivated here is a possible solution to the inaccurate reading after changing out the fuel pump: Clicky click

Symonsy69: I answered your follow upwardly thread with my best guess.

Good luck!

06-14-201709:41 AM

Quote Originally Posted by Scrwedtxboy31 View Post

Dito, I accept the aforementioned Vehicle as the OP, and the same problem. Looking into opening her up this night. My issue is why am I smelling fuel upon kickoff-upward/warm-up? The fuel pump is literally under 3K mi new. Anyone have the same issue (smelling fuel)? or does anyone know if that effect is correlated?

Reviving onetime post.

Fuel pump died. Had fuel pump replaced in March. Started smelling fuel. I figured they but spilled it and it would go away. Noticed whenever I would top off, smell would become worse. A week or 2 afterwards, fuel level wasn't reading properly.

I'1000 thinking either equally described above, things just demand to be jiggled around or they didn't reconnect that small clip (sensor) and a gasket is either broken or not seated properly (smell).

I'd beloved some input on this. I haven't driven the auto in three weeks due to the smell. It gets worse with the heat.

Cheers!

06-19-201707:22 AM

I would say it's leaking.Pump is probably non seated all the way or the o ring rolled.

06-twenty-201712:04 PM

Quote Originally Posted past old guy View Post

I realize that this is a three year old thread merely since it has been reactivated here is a possible solution to the inaccurate reading after changing out the fuel pump: Clicky click

Symonsy69: I answered your follow up thread with my best guess.

Good luck!

When I replaced my fuel pump, my gauge didn't read right either. Then I establish this mail by Sometime Guy and bam, it was exactly what caused the problem. The lilliputian vent tube wasn't placed in the outer funnel shaped hole, resulting in it not reading correctly. I fixed it and its been 100% e'er since.

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