Combustion in fuel?

[bigfords]

I've got an old Econoline we are working on that fires up, runs and then eventually loses power and dies completely. Narrowed it down to a fuel issue. It seems like air is getting in the fuel system. Supply and return fuel is good. Has anyone had issues with getting combustion in the fuel system? Bad copper crush washer and lower injector maybe?

thanks!

 

[DEEZUZ]

Injector may be loose, which in turn let combustion by which melted the copper. Hydrolocking will happen soon

 

[joe d]

Agreed with above. Also check fuel line quick connections on driverside engine bay. Ive seen those suck air. If you want i have a set of alliant o rings never opened. 50$ plust shipping..
Joe.

 

[79jasper]

What year is it?

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[bigfords]

96 with fuel pump that runs off cam. I'm hoping it's loose injector, I was thinking along that could be an issue.

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[DEEZUZ]

Recent injector work?

 

[bigfords]

I talked to the previous mechanic and he said he put 2 injectors in it 2 years ago. Guessing it's one of those. I will probably try and get at one side tomorrow and take a look...got to love Econolines!

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[79jasper]

Take a peak at the fuel filter.
I think if it's getting combustion gasses into the fuel system, you should get soot in the filter.

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[ghohouston]

its a long shot, but there are quick connects with o rings where the fuel lines run up the side of the motor, they can get brittle and suck air

 

[bigfords]

Good info. Fuel filter looks ok with no soot or anything. Does seem aerated and doesn't always build pressure like it should. It is a very strange problem to say the least.
Also to note, I do not have any circuit codes for IDM or injectors, but when running the injector buzz test, #4 has a significant lower/different noise to it than the rest when it clicks.

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