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Discussion Starter · #1 ·
My 1999 F350 has 302,131 miles on it.

The water in fuel light came on recently and I cleared the water out and changed the filter. The engine developed a miss and it became progressively worse now the engine will not run.

I've had quite a bit of experience with these engines and have gone down the list of typical trouble shooting.

Changed Crank position sensor.
Fuel pressure = 55psi
ICP replaced the sensor and the pigtail, it was leaking oil.
Changed the pigtail on the IPR, insulation was cracking off the wires.
I put a test gauge on the high pressure oil port in the head. Cranking engine will build pressure to almost 3,000 psi.

I just got an Autoenginuity with the ford enhanced package yesterday and ran a buzz test on the injectors and it passed.

I get no engine related codes.

The ICP shows 14.8% with key on and goes up to around 50% duty cycle while cranking.

My thoughts are that with the oil pressure going that high while cranking the injectors are not functioning correctly, in that the oil is not going through them or the pressure would not get that high.

With this many miles on the truck I would assume I need new injectors but don't want to start blowing a bunch of money and find the problem is something else.

I am the first owner of this vehicle, and it ran fantastic until the water in fuel issue. I have maintained everything regularly. It has had no major engine work.

Any advice on how to diagnose this would be appreciated.

Thanks, Tom
 

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Tom

I think you are on the right track with the injectors. They may just be flat worn out with your mileage. You could pull the valve covers and injector solenoids off and check the clearance between the injector body and the armature with a feeler gauge. If they measure less than 0.001 inches then you should consider replacing the injectors.

Alternatively there are shims available to increase the clearance. PM user RT For a source for them.
 

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Discussion Starter · #4 · (Edited)
Thank you both.

I followed a little hunch I had and decided to look at the check valves in the head to make certain something did not get past the filter and clogged the screens.

As I loosened the fitting I was surprised not to have a but of fuel leak out, the lines were completely dry and the check valve looked pristine inside.

So now I know I have a fuel delivery issue. Pulled the filter and all looks well but decide to remove the check valve stem and look it over. That thing is so messed up I can't figure out how or why it could be in the condition it is in.




The steel rod had penetrated the upper section of the valve, and I could not get the thing disassembled. I've put new O rings in these before and they pop right apart....I used pliers and screw drivers to try and pry into this one with no luck.

I installed a new filter, and she came back to life. So I have a running 7.3 now.

Scanned it with AE and I have codes on Cyl. 1, 3, 8. It runs pretty crappy, but I also have knocked the stem off of the MAP sensor so I need to replace that and see how it runs later.

I still may need to do the injectors, but if you'd be kind enough to explain the procedure for checking the clearance, I'll do that prior to pulling anything out. My engine does not get better with heat up or time running.

Thanks again guys, I really appreciate the feed back.

Tom.
 
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