I've got a 1997 F250 HD 4x4 (old body style).The problem I have is that after the engine is fully warmed up,if left idling for a few minutes it will shut off and will not start for about 10 mins.Engine spins,but no start. Thought it to be an ignition issue.I installed an MSD coil,new TFI module,new IAT sensor,new plugs,cap,wires,fuel filter,crancase filter and a K&N air filter. Still having same problem. I picked up a spark tester and after truck stalled , tested it.Engine has plenty of spark so,leaning more toward fuel issue. Regulator?Another sensor for injection? Any ideas are greatly appreciated.

Thanks

 

Did your gas station recently switch to ethenol blend in the gas??

You are experienceing vapor lock.

More common on warmer days and hot engine compartments.

Basically the fuel boils in the fuel line disrupting fuel flow starving the engine for fuel.

We have experienced this in Colorado with the oxygenated fuels (Ethenol and MTBE) for over 20 years.

It is also the reason emergency vehicles like ambulance/fire and police don't run it.

 

Have only been buying at stations that are selling non-blended fuels. Any remedy for vapor lock? Never had this problem before. Only showed itself in the last month or so.

 

THis sounds like a failing fuel pump. DO you have two tanks? Try switching to the other tank. YOu can also get a fuel pressure gauge and hook it up to the schrader valve.

 

Yes,have dual tanks.Does it with either tank.