97 OBS Lift pump failure?? - Ford Powerstroke Diesel Forum
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post #1 of 54 Old 05-13-2013, 08:24 PM Thread Starter
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97 OBS Lift pump failure??

As you guys know I don't frequent these parts of the forums too often, but I have a buddy that has a 97 OBS 7.3L but is failing to get fuel to the top of the engine in engine mounted filter housing (not sure if there is one). He wants me to come look at it but I need to know what to look for and what to try so that I can possibly diagnose his truck's issues. Any help would be appreciated. Thanks guys.

l BRYAN l


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post #2 of 54 Old 05-13-2013, 09:07 PM Thread Starter
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post #3 of 54 Old 05-13-2013, 09:24 PM
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There is a tire pressure valve on the side that you can use to see what kind of fuel pressure your getting. If none, and there is no major fuel leaks. Replace the fuel pump. I would hope he is well over 200k before he needs to replace that pump though.

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post #4 of 54 Old 05-13-2013, 09:27 PM Thread Starter
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He said that it has a lot of miles but it ran great then all of a sudden it won't start. Is there a fuse or relay I should check while I'm in there? Pictures of said pump and valve your talking about would be great. Thanks for the help .

l BRYAN l


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post #5 of 54 Old 05-13-2013, 09:36 PM
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Its really easy to see the Schrader valve there. It should have a tire like cap on it. What are the symptoms?

Crank, but rpm gauge doesn't move?= Cam sensor or Fuse in the panel below the steering wheel. Cure if its the fuse is to unhook the fuel bowl heater. Look for a thread on how to do that.

No fuel pressure is most likely the pump.

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post #6 of 54 Old 05-13-2013, 09:36 PM
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there's a mechanical pump in the valley that's the only fuel pump on the obs trucks, also check the fuel lines if they crack itll suck in air and not run

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post #7 of 54 Old 05-13-2013, 09:38 PM Thread Starter
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Good stuff guys keep it coming. Thanks.

l BRYAN l


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post #8 of 54 Old 05-16-2013, 10:07 PM
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Quote:
Originally Posted by gabegoforth View Post
Its really easy to see the Schrader valve there. It should have a tire like cap on it. What are the symptoms?

Crank, but rpm gauge doesn't move?= Cam sensor or Fuse in the panel below the steering wheel. Cure if its the fuse is to unhook the fuel bowl heater. Look for a thread on how to do that.

No fuel pressure is most likely the pump.





bowl heater is in the engine compartment box not under the wheel one
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post #9 of 54 Old 05-22-2013, 10:18 AM Thread Starter
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Ok so I made it out to look at that truck today and this is what I found.

Pulled the fuel filter cap and there was about 1/4" of fuel in the bowl. Pressed in the Schrader valve and there was no pressure. Turned the key on and didn't hear anything either. Tried to crank and no fire (not surprising).

Remembered someone saying something about a fuel selector switch, I located the switch and flipped it to the rear tank. Tried cranking again and this time it started to fire. It wouldn't start BUT it was starting to fire and sputter like it wanted to start.

So my question is this, does that mean that it is a fuel pick up problem in the front tank causing it to not get fuel? If so what kind of time and parts are required to fix it? Anything else I should be checking as well?

I also climbed under the truck and looked at the rubber soft lines and they were all good, almost like new. Truck has 350k+ on it and is a little beat up. If I get it running the owner wants to sell it outright and be done with it. It just got a brand new Jasper racing transmission ($3500) in it as well. What kind of price range should he be asking for it (it is kinda rough, body is in decent shape, right bed panel is dented in but no rust anywhere on the truck and it is a 2wd, Interior is rough as well) he isn't looking to get rich just wanting rid of the truck he is a pipeliner and travels the country for work so he doesn't need this truck anymore. Thanks for the help guys.

l BRYAN l


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post #10 of 54 Old 05-22-2013, 10:36 AM
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Maybe $4500 not running, but 5k running, those miles kill the price, and the dented body

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