I have a 1998 covertible, just recently i noticed a small gas leak at the left rear of my car after i have driven the car. the amount of gas is about a 1/4 cup of fuel. I have loosened the fuel cap to release the tank pressure. My car has 48,000 miles on it. Iam just wondering if any other c5 owners have expierenced the same problem ? at a loss

 

It's the fuel filter if it leaks near the drivers door,at the rear as you discribe I would think it's one of the tanks,is it from the overflow? Did you just fill up when this happened? Go ahead and check the fuel filter ,it's in the frame rail just under the drivers door.

 

and they're very easy to overflow. The fuel filters are kind of a bad deal, I changed one and they're not that safe being right over the exhaust pipe. Better get that checked out!

 

There seem to have been a lot of fuel leaks recently. I took a look at the book and there are a few connections that could leak.

Start by examining the fuel filter connections next to the exhaust system.


The main fill pipe routes from the cap to the tank. There’s a connector at each end of the fill pipe. One of the early problems was slow filling and GM redesigned the fill pipe to get a better flow.


1. Fuel filler hose
2. Vent pipe

Next check the fuel sender, the aux fuel rear return pipe that connects the jet pump to the left tank and the aux fuel feed rear pipe that connects the left tank to the jet pump at the fuel sender. The FLVV hose routes to the EVAP canister. Finally the crossover pipe connects the two tanks but that’s at the top of the tank so I guess it would be hard to see from below.


1. Auxiliary fuel return rear pipe from the jet pump to the left tank.
2. Fuel return rear pipe.
3. Fuel feed rear pipe at the fuel sender

If the leak doesn't show until the tank is getting full that would be the time when the fuel is starting to fill the right tank via the crossover pipe. It may give a clue.


1. Left fuel tank EVAP pipe.
2. EVAP pipe quick-connect fitting.
5. Tank crossover hose 1. Left fuel tank EVAP pipe.
2. EVAP pipe quick-connect fitting.
5. Tank crossover hose

I've never looked in there so not sure how easy it will be to see all these connections but I'd guess you'd need to get the car up on a lift.

HTH

 

Good job DEEGEE.

 

This is common on 97 and 98s. Its the plastic oring inside the filter. Just get a new filter 15 bucks and some of the quick disconnect tools to make it slightly easier.

 

great write up DeeGee thanks

 

Very good info there, DeeGee. Hopefully it is something easily fixed.