[rummikube]

I have a 1991 Bronco XLT. I dropped the gas tank and replaced the fuel filter. It will run great in the morning. If you try to crank it a couple of hours after running it it will start back firing and die. I don't have bad gas. There is pressure comming from the fuel tank, but when you use the release valve under the hood (the thing that looks like a bicycle tire valve) there is both gas and air. I can't figure where the air is comming in. I can't find a leak in the gas lines. But, I do have a minor exhaust leak. I NEED HELP! Any suggestions?

 

[kf4amu]

buy a fuel pressure gauge to tell for sure.

You may have fuel boiling in the lines from getting too hot. Does it get better on cold days?

 

[rummikube]

I just bought it a couple of weeks ago, so I don't know. The dealership check the pressure on the lines. It is okay, they are at a lost too.

 

[rummikube]

Does anyone else have any suggestions?

 

[TheUnforgiven]

buy a fuel pressure gauge to tell for sure.

You may have fuel boiling in the lines from getting too hot. Does it get better on cold days?

i can't even remember what that is called.....damn........

kf4amu, is that even possible with fuel injection running at 40 psi in the lines?

 

[sewiv]

vapor lock is what it's called.

 

[rummikube]

Can it be true vapor lock, it's fuel injected instead of a carborator, and it is happening continually.

 

[sewiv]

I don't know if it can, I was just answering what it was called. Sorry.

I think that's part of the point of EFI, to avoid vapor lock, among other things.