New Guy with bad 7.3 HPOP, I think? - Ford Powerstroke Diesel Forum
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Old 11-05-2010, 12:19 AM
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New Guy with bad 7.3 HPOP, I think?

Hello everyone, new to the site but have a problem. This is my first diesel engine and it quit on me all of a sudden. History/facts: its a 2000 F250 7.3 (2WD) with 220K miles. (while Working offshore) I was told I had a mystery oil leak but the oil level was fine. Upon getting home, I noticed the truck loosing power while pulling my tractor and trailer, then it died. Would not start with either, found no power getting to fuel pump (was told the computer will do this for saving the engine?) Turn the key on on no fuel pumps into the filter can. Was told to replace the cam sensor, I did. Was told to replace the temp sensor on the HPOP, I did, still no start. Checked the oil level in the HPOP, it was empty. Solving the mystery oil leak, I filled the HPOP, reset the computer, still no start and no power to the fuel pump. Before I spend the $750-$950 for a HPOP to try and fix the problem and it not work, I am here looking for your experience in trying to solve this problem before wasting money. All the fuses and relays were checked out and good. What could I possibly check now? Any help would be grateful.

David
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Old 11-05-2010, 03:45 AM
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If you are not getting fuel from pump to bowl it is not a hpop issue.
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Old 11-05-2010, 04:01 AM
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is the fuel pump working?
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Old 11-05-2010, 03:37 PM
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negative, the power has been shut down to the fuel pump by the computer I am told. I kept cycling the ignition while checking the wires going to the fuel pump, and nothing. Also watched the bowl as the key was turned on and no fuel. I have checked every fuse and relay under the hood and under the dash and they are all good. Being new to the powerstrokes or any other diesel, the local guys keep telling me to replace the HPOP. Easy to say if you are not the one spending the cash. When I found out the oil resivor on the HPOP was empty I refilled it. Do I have to prime this thing somehow or does it prime itself to the injectors?
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Old 11-05-2010, 03:59 PM
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I was told that if the computer shuts off power to the fuel pump, it could be a bad cam sensor/bad oil temp sensor (on HPOP)/bad oil press sensor (on HPOP). I replaced all three. Was also told that by placing a gas soaked rag over the intake and the motor wont even burb fart or try to start, that it could only be the HPOP. Now I understand the workings of what the HPOP does but. Something electrically it telling the computer not to run the fuel pump. Since I replaced the two sensors on the HPOP, then the computer should let the fuel pump run. Eventhough the fuses were good and checked with an ohm meter, I replaced with new ones and still no power getting to the fuel pump when I turn the engine over. I'd hate to drop $1K on a new HPOP and do the same thing. If you think it is not the HPOP at this point, I am up for suggestions to test some other things and let you know my results.
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Old 11-05-2010, 05:13 PM
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Check to make sure the fuel pump inertia switch hasn't been tripped somehow. It should be on the passenger side just above the kick panel. If it has been tripped it shuts the power off to the pump.
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Old 11-05-2010, 05:39 PM
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the button was not poped up to reset. I pushed down on it but it was already down, still no fuel going to bowl or power going to pump.
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Old 11-05-2010, 06:45 PM
PMR = JUNK

 

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It could simply be a bad pump.

And NEVER use ether unless you unhook the glow plugs!!!
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Old 11-05-2010, 07:00 PM
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Roger that. I am coming to that conclusion also. I've tried everything I can think of but will be upset if a new HPOP doesnt fix the problem.
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Old 11-05-2010, 07:42 PM
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If you aren't power to the fuel pump, it is NOT the HPOP. HPOP only controls oil pressure to injectors.
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