Dominic Toretto

A few weeks ago my fuel gauge dropped to empty while driving and I knew I had just under half a tank while driving. So I stopped, got some fuel injector cleaner(no Techron available at the Chevron I stopped at) and took off. A few minutes of driving and the gauge went back to where it was. Now just last week I took advantage of the O'Reilly's deal and grabbed two bottles of Techron and waited until I needed fuel again. Put both bottles in there and filled up with more Chevron gas and a few days ago (On the same tank) my gauge drops down to empty again WTF? I am 90% positive it can't be the fuel sender as I am ONLY using Chevron fuel and I have used fuel injector cleaner plus two bottles of Chevron on the last fill up. All this in less than two months time. Any ideas?

-Alex

dougbfresh

And how can you be 90% sure it's not the sender? You can check the connections and grounds but my money is on the sender going south.

rclinton

What code are you getting when the fuel gauge drops to zero? P1432 or P1431?

Dominic Toretto

Beginning the think the same

I'll run the codes on lunch and get back with what I find.

-Alex

vet85

mine started the same crap 4 weeks ago ...never a problem before ....ive added seafoam to it since ,,,still wont work.and 90 percent of the time use shell gas cause its right beside my house ....so im waiting to see if it starts working again or not ...good luck

Dominic Toretto

As luck would have it, when I moved my car for lunch, the gauge went back to reading correctly. However, I did pull the code P1431H.

-Alex

burbleflyer

Two years ago on a trip mine started going and being on the road it was hard to find Techron. I was putting any fuel cleaner in that I could find and it seemed to make it worse. Once I got some Techron I just kept putting it in every tank and eventually it came back.

It still goes out now and then but one bottle of Techron and boom! It's fixed.

Be patient and keep adding one battle every tankful until it's fixed. The for another couple tanks and you should be fine.

Han Solo

I don't know about the rest of you but when mine started doing this a couple of weeks back it would not come back until I cleared the code. The very second I cleared the code the gauge came back on. I had to reset it a few times during the week while I waited for the fuel cleaner to work.

81c3

I have the same problem Alex. Its the sending unit. I just keep the tank full and it seems to work fine until it hits the area just below 1/2 tank.

Dominic Toretto

LMAO, you definitely have the same problem, as that is exactly where mine is having the issue at.

Have you gotten a quote for the service on this?

-Alex

venomws7

How hard is fixing the sending unit? what do I need to buy?

I have the same damn problem!!!! and we dont have techron around here..

Nick1

You may want to do a search on this, it may be part of a greater problem that could leave you stranded- running out of gas while there is still much more left in the tank!
I am a little nervous about this since just starting to have an eratic fuel gauge for the first time. Apparently there is a pin-hole venturi in the passenger side tank that )of course) clogs easily and causes problems. In some cases it needs to come out and be physically cleaned. Not sure about the '04s which have a new style tank arrangement. Can the pump and flow units be removed from the top without dropping the tanks out the bottom?? (big question)

LoneStarFRC

Mid '03s and all '04s have to drop the tank, all other's tank(s) can stay in car.

RH module: 89047746 (for '97 to mid '03) GM indicates this one has improved sender card.

Buy from Fichtner Chev or GMpartshouse for forum pricing. Comes complete with new gasket and screws.

rick4grafx

How do you pull the codes, I am having the same problem. Do you need a scanner? For a 2002 C5?

Fast one

I don't trust any gas gage and use the trip odometer as a backup.

HG

look here http://www.stengel.net/diccodes.htm

her's another interesting tid bit http://www.hessh.de/Corvette/FuelTankSystem.pdf

evergreenbar

Checkout TSB on corvetteactioncenter. A re-flash of PCM might do the trick. Spent a fortune on Techron over the last few years-it didn't work in my case. The re-flash did.
Good luck.

duramaxsky

Mine had. The problem when I got it. It took 4 tanks with Techron to fix it. Orileys has the 2 for 1 deal now ends soon. I got 6 more yesterday.

KCvetteowner

I just spend the 10 seconds to clear the codes so my gauge starts working again. Seems easy enough....
I used to add Techron until about 3 years ago and shell v-power seems to have eliminated the gauge issues for me... gas is expensive enough WITHOUT adding techron..

Vettmann17

I would try at least four treatments of 20oz bottles of Techron, more than likely this should solve the problem as most of the time it is sulfer contamination on the sending unit. I had the same problem about four years ago and unfortunately I was in the minority as it wasn't the sending unit but a bad jet pump in the tank. The tank (I'm not sure which one) had to be dropped which the rear end also had to come down to get to it. All said and done it was a $1600.00 job if I remember correctly, and it has been fine since. I've never added Techron before that and not quite sure if it would have prevented my problem. Since then I add a 20oz bottle every 3K as preventative maintanance and so far so good. I hope the Techron solves your problem, let us know how it works out for you. Good luck bro!