Engine/Transmission (1994 - 1998) starts......then dies

[BClement]

Just started doing this, like it is losing prime. Should the 1/8 i.d. vent hose be open ? I cannot blow in or suck out any air. The tank goes woooosh when I remove the cap . Takes a day or two of sitting.

97 3500

 

[The patriot]

Did you try starting it with the cap off?

 

[BClement]

Did you try starting it with the cap off?

Yes.......After priming It would start, like a filter change. Checked the tank vent, but it does not seem to exchange air in either direction

 

[DonFitzwater]

Did you replace you're return line yet?

 

[KBurgoyne]

more information please. If there is an air leak in the rubber lines, or one of the connections that can happen. try hooking a compressor with a nozzle attachment to the rubber fuel supply hose and clamping off the return. If there is an air leak you will see bubbles. Only use 10-15psi. Either take the starter off or the tire/mud guard for access. The fuel system write up might have a diagnosis for that problem. Try and explain it as best as possible first so you don't waste as much time as I did.

 

[BClement]

have not replaced any lines yet...loosened the fuel cap and will try to start it tomorrow. 36 hrs. of sitting

 

[BClement]

Pretty interested in finding out how the fuel vent line works.....should exchange air both ways
, in my little mind

 

[GAmes]

The filler cap on mine has made a whooshing sound on mine since it was new. You have an air leak. Use KBurgoyne's advise to find it. More info here. http://www.cumminsforum.com/forum/94-98-engine/58777-joe-gs-fuel-system-writeup.html

 

[Missouri Mule]

The there is a relief/rollover valve in the tank module(near the the vent line). It apparrently opens to release pressure from tank and closes if you put truck on it's side or top.
The fuel cap also releases pressure but main job is to keep the tank pressurised.