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Discussion Starter #1
Hey Guys

1995 f350 7.3. The truck won't start on it's own. If you give it an ether shot, it starts for the moment that the ether is in the engine after that dies immediately.

I have fuel in the filter bowl and am going to replace the filter this morning.

No visible leaks of fuel.

Any ideas on where to look first for low fuel pressure issues?


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How did you determine that your issue is fuel pressure related? It's in your title but you didn't explain it. Are you sure it fuel related? Reason I ask is there are a couple other things that are really common for your issue.
 

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Discussion Starter #3
Sorry. To clarify here are my reasons for thinking fuel related:

-I know there is a leaky injector O-ring, been this way for a year.

-Truck sat for the last 6 months as it is my plow truck so I feel like the fuel pressure has diminished over time with that leaky injector O-ring

-When we press on the schrader valve you get essentially zero fuel coming out the valve

-I crank and crank and crank with the truck sounding absolutely lifeless, give it a shot of fuel (propane, ether) and it runs.

Hopefully this helps


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Have you checked the fuel pressure with a gauge while cranking? Or at least depressed the schrader while cranking? Or are you checking it at rest?

O-ring won't affect your fuel pressure at the FPR. If it sat for six months and now won't start I would check the oil level in your HPOP and make sure it's up then check fuses, all of them but make sure you check #22.
 

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Discussion Starter #5
Have you checked the fuel pressure with a gauge while cranking? Or at least depressed the schrader while cranking? Or are you checking it at rest?

O-ring won't affect your fuel pressure at the FPR. If it sat for six months and now won't start I would check the oil level in your HPOP and make sure it's up then check fuses, all of them but make sure you check #22.
I have checked it with a fuel pressure gauge and it showed almost no fuel pressure. BUT I did not have an awesome connection to the schrader valve and saw fuel leaking from the gauge. With that, I'm not confident in my findings. I'll be checking that again this morning along with all my fuses and the hpop oil level. I really like that idea based on my knowledge of the importance of the hpop. I've never checked the oil level on the hpop, anything special?

Thanks,
Eric


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Discussion Starter #6
Plenty of oil in the hpop. Filled all the way to the top with oil, no room to spare. Everything i have read says its not worth changing the hpop oil, so I suppose I wont. Going to grab a new fuel filter just for the heck of it and then check my fuel pressure again at the FPR while cranking.
 

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Discussion Starter #7
Not the larger fuel filter. I am going to remove the small fuel bowl under the schrader valve and check that filter next.
 

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Discussion Starter #8
Cleaned the fuel filter from below the schrader valve, nothing spectacular. Got a better a more accurate reading out of the fuel pressure gauge, after cranking for a few 5-10 seconds I am seeing 50psi. It depletes once I stop cranking, not sure thats related to my starting issue, could be an imperfect fuel pressure gauge connection. Not sure where to go next.
 

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Yeah that's good pressure to fire. I think you might have an electrical issue. Have you tried a new CPS?

Some of us change the hpop oil. If nothing else it's another bunch of oil that's gets changed at oil change.
 

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Yeah that's good pressure to fire. I think you might have an electrical issue. Have you tried a new CPS?



Some of us change the hpop oil. If nothing else it's another bunch of oil that's gets changed at oil change.

Ya turns out it was the CPS. That thing has bitten me in the butt more times than anything else with this truck


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Hey right on. Glad you got it fixed.
 
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