I know there may be a few post on here but nothing that ended with a conclusion. So I have a 96 850 turbo that will stall out after filling tank completely up "stop after pump shuts off i'M NOT OVERFILLING". After filling up car will crank for a long time before starting and will die if I dont give it more gas. Its seems after I get down to the 18gal mark on the gauge most stalling/idle problems stop. I did have a 244 code and found a torn vacum cap on the carcoal canister but I have repaired that and there are no vacumn leaks in the engine compartment. So what could be causing it? No codes are currently in system.

 

Any gas odors in the car/trunk?

Might have a problem with the fuel pump.

 

No odors in car, I replaced fuel pump 2 weeks ago with new volvo complete pump.

 

This is just a WAG but sounds like it's running rich when the tank is full; by opening the throttle to start it you're actually leaning out the idle circuit.

Again, just a guess, but possibly the canister purge valve is stuck open; below from '95 850 manual.


FUEL EVAPORATIVE SYSTEM (EVAP)
Evaporative emissions system is designed to prevent fuel
vapor from entering atmosphere. Fuel system is completely sealed and
vented only through a carbon canister. System consists of
pressure/vacuum relief fuel filler cap, rollover valve, charcoal
canister, purge valve and various connecting hoses.
Fuel pressure/vacuum relief filler cap allows excessive tank
pressure to vent. It also allows air into fuel tank if vacuum should
become excessive due to a malfunction in fuel evaporation system. Fuel
tank vapor is vented by a line through rollover valve to charcoal
canister. Rollover valve is located in vent line close to fuel tank.
Valve is designed to prevent fuel spillage if vehicle rolls over.
Valve is open until vehicle is at a 45-degree angle or more from
horizontal position.
Canister Purge Valve
Charcoal canister is filled with activated charcoal. Fuel
vapor from tank is absorbed by charcoal when engine is not running.
When engine is running faster than idle, canister purge valve opens
and fuel vapor is drawn into engine and burned.

 

Thanks I was suspecting that I need to get a evap test done and see if the valve is working and releasing/holding pressure. I;ll let everyone know what happens.

 

gdog, You were correct about the evap valve stuck open and causing starting/stalling issue..Replaced evap problems fixed....

 

Hi ram 2500, interesting as I just gave up a 2004 ram 2500 company truck after five years of loving it and now am driving a 95 850 turbo to work. Anyway I'm having the same problem, did you replace just the little purge valve near the radiator or the whole system? Also, mine will only take about 14 gallons bone empty, ideas? Thanks

 

I just replaced the Evap valve near the radiator. If your having problems not being able to fill the tank maybe the fuel tank vent house is clogged.

 

Thanks, I'll look into that.

 

Well I'm still having the same problem. After the tank is filled up it keeps stalling out until I run a gallon or apx 10-15miles. I can start it back up with my foot on the gas pedal. Any other ideas?

 

Any codes set? Is this the same symptoms as before, or different at all?

 

no codes set. It only stalls out/with irratic idle with a full tank until I run a gallon out. After I run a gallon out or apx 10-15 miles all stalling issues go away and car runs fine.

 

OK, this is a strange one; think you're going to have to do some troubleshooting here..

Did this problem go away for two months after you changed the evap valve, or did you just think it fixed it, and the problem re-appeared shortly afterward?

I would do a vac test on the evap valve; verify it is closed at idle.

Beyond that (and this is a long shot..) I would hook up a fuel pressure gauge semi-permantly (so you can drive with it hooked up; preferably being able to read it while driving; this is dangerous - be careful!!) and see if you see any change in fuel pressure (at idle) between full and not-full tank conditions. If you see a significant change, i would suspect the fuel pressure regulator.

Let us know what you find..

 

Water in your fuel tank. Run some methylated spirits next time you fill up.

Regards, Andrew.

 

Once I replaced the evap valve it did not stall out right away. It would take a few mins of driving then the stalling out would return. I do have a fuel pressure gauge I would have to get an extension for it. What is the fuel pressure suppose to be and is the pressure suppose to stay the same when the car is turned off? Thanks

 

I've ran a few bottles on methylated spirits before. That was months ago. No change
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