I`ve been having a problem with my work van, its a 1993 E350 with the 460 engine.
For a couple months now. Every time I get gas, the van stalls and dies when it tries to idle, it runs fine at other RPMs . If I keep the RPMs up slightly while stopped it stays running fine. Once the fuel goes down to around 7/8 of a tank or less the van runs fine no stumbling or anything. It runs fine till the next time I get fuel. I recently tried not filling the tank fully, and it seems to run ok with out dying or stumbling, But I`ve only tried it once.
Anyone got an idea what would cause the idling problem when I have a full tank?
Any help appreciated
Greg

 

It's likely to do with the pump, could be a bad wire, full causing it to cut out, injection is demanding, the pump must run constant.

 

Hi minnow,
it could be the vapor system sucking up full and flooding the engine. Some vapor systems just have an orifice in the throttle body to pull vapor from the tank, if the tank is overfulled and the charcoal vapor canister fills with gas, the extra fuel floods the engine, especially at idle when vacuum is highest.

Try removing the vacuum hose from the canister or throttle body (plug the vacuum port) and see if that helps. That will put you in the area of the problem, at least. jim

 

When the gas pump clicks off, do you continue to stuff fuel in the tank a few more times?

 

You could be onto something with the vacuum canister it acts more like its flooding out, than fuel starving.
I dont overfill the tank typically.
I would think if the fuel pump was shorting out when full, that it would run worse at high/load rpm than just at idle.
I`ll try removing the vaccumm soon and see where that gets me.
Looking forward to working on a van, sometimes I wonder how come a have so many of them
Thanks everybody I`ll see where this get me