95 F-250 Auto HeavyDuty Fuel press problem? - Ford Powerstroke Diesel Forum
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Old 08-06-2013, 08:50 PM
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95 F-250 Auto HeavyDuty Fuel press problem?

First... many thanks in advance to anyone collaborating with this thread. I hope I'll be able to return the favor some day.

Then... my dad lived in Argentina, I lived in Vietnam. He passed away, I returned to Argentina to take care of his business and... his truck:

1995 F-250 7.3l Auto 4x4 Heavy Duty with (I believe)
The truck is in good shape, rarely used for work, mostly grocery getter.

I started using it and ran ok for the first month. Then it started doing very short (1/4 second) misses, usually at highway speed. Then the misses became complete engine shutdowns for 1 or 2 seconds. Then the engine would start again. It would be very random. Finally, it would stop running 100%. I would wait a few seconds, or a minute, and start again. (Nice description of a CPS failure... right?)

Parts are very difficult to find here.. so I ordered a CPS sensor, but kept using the truck, taking the risk. But the next few failures where a little different, the engine would still run but loose power, misfire, then run ok again for a a few more miles. It did that about 3 times, until the power did not come back, but it ran enough to get me home.

I shat down the engine and it never started again. Eventually the CPS arrived and I was hoping that was going to be the end of my troubles. Changed it. No start.

I started to suspect fuel starvation. I brought down the aft tank, opened the sender, inspected lines, blew air through both pick up and return lines, checked tank selector valve, blew air on all lines again... all clear. I emptied the fuel filter bowl, checked all lines, blew air. Clear. Installed all again.

So next, with the filter bowl empty, I checked pressure at the shrader valve, and at the same time checked if bowl is loaded with diesel. Pressure barely reached 3 psi and fuel was coming up very slowly. I imagined I had a bad fuel pump (original mechanical pump on this one). I was very lucky and found a new pump in my dad's garage. Changed the pump. Cranked and pressure started to come up very slowly. Opened the filter bowl, filled it up with diesel, closed and cranked again. Pressure started to climb and continued to climb very slowly up to 35-40 psi. By the time I got there I was running out of battery. Engine did not even once showed signs of firing. After cranking fuel pressure will not come down. After 45 minutes the pressure was still at about 30 or 25 psi. Is this normal? Does the fuel system remain pressurized?

Of course I suspected Fuel Pressure Regulator bad. Opened every hole on it but could not find anything wrong, other than a plugged screen, that was cleaned in minutes. The rest of the FPR looks ok, but don't have data about ho to check if it is actually working ok.

This is all I have...don't know what to do next. Suggestions?
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Old 08-06-2013, 09:26 PM
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I did change my pump recently and at first it did stay pressurized. It would squirt out pretty good even when the engine was shut off. Last time I checked it didn't squirt out when it was shut off, so, not sure if I have another issue or if that is normal. I do know that the IPR(Injection Pressure Regulator)(it is mounted just ahead of the FPR) mounted to the HPOP is what allows fuel to the injectors. If there is something wrong with it you will still have fuel pressure at the FPR but none at the injectors, check the wiring to it and apparently the solenoid sometimes comes loose as it is one of those cheap tin type nuts used to hold it on. My truck had a no start unless plugged in and when it was hot if I shut it off it would not restart if I tried immediately, it was caused by a bad o-ring and backup ring on the IPR valve assy. I guess a bit more info would be helpful- how many miles/km on truck? Another quick check is fuse 21 if I remember correctly- it is the fuel heater fuse- although the missing thing doesn't lend me to go that route but it is an easy check- it definitely causes a no start condition. The missing and loss of power thing leads me to think it is a different problem to the solutions I have listed maybe someone else will give some advice. My truck took a while to build up pressure but it should be higher than 40 if I remember correctly.

Last edited by fasteddy88; 08-06-2013 at 09:30 PM.
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Old 08-06-2013, 10:58 PM
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I had the same problem turned out to be my idm


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Old 08-07-2013, 06:44 PM
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Quote:
Originally Posted by fasteddy88 View Post
..... I guess a bit more info would be helpful- how many miles/km on truck? Another quick check is fuse 21 if I remember correctly- it is the fuel heater fuse- although the missing thing doesn't lend me to go that route but it is an easy check- it definitely causes a no start condition. The missing and loss of power thing leads me to think it is a different problem to the solutions I have listed maybe someone else will give some advice. My truck took a while to build up pressure but it should be higher than 40 if I remember correctly.
Truck has about 200,000 miles. I will check the fuses again... I don't remember seeing anything wrong the first time I looked.
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Old 08-10-2013, 06:30 AM
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More info..

While cranking RPMs stay over 150, and obviously with tach reading fine.
I will be checking HPOP oil level... question is, why would it be low?
Thanks,
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