97 f350 7.3 Lift Pump Question - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 03-20-2010, 07:28 AM Thread Starter
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97 f350 7.3 Lift Pump Question

I am going on vacation about 2500 miles pulling a 13000 lb trailer, in 2 weeks and I bought a new lift pump that I am going to try and put in my self in hopes to save a little bit on fuel cost because mine is dripping. Questions, First does the weep hole leak more fuel running down the road verses at a idle in the driveway? Second I have never done this before and scared that I might make things worse if I attempt this myself. Third does the pump go completely out or is it just famous for leaking. Any suggestions are appreciated,Jeff
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post #2 of 13 Old 03-22-2010, 07:05 AM
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they just get realyl weak and get to the point they dont provide enough pressure from what i can tell. as well as leak.

there are some good write ups aruond here on replacment. i believe there are some in the 7.3 tech section as well.

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post #3 of 13 Old 03-22-2010, 08:06 AM
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Naturally it will leak more when its running down the road, its pumping more fuel.

Its not too hard, but time consuming, you need a 1 1/4" box end wrench to get the banjo bolt out, and you have to remove the fuel bowl and the fuel lines on it. Its not real hard, but more of a pain.

And yes, they just get weak, and begin to weep fuel. you cant see the weep hole, but you'll see fuel in the valley.

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Last edited by weareweird69; 03-23-2010 at 06:59 AM.
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post #4 of 13 Old 03-22-2010, 02:40 PM
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Some guys will pull filter assembly and lift pump with hoses attached and yes it is a pain but satisfying.Take care when lifting pump,can be pryed up evenly and watch for the little push rod they always speak about.When I did mine the "rod" which came with the pump, was more like a small engine valve that rides the camshaft and thus operates the tandem pump With new pump in hand you will feel more confident
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post #5 of 13 Old 03-23-2010, 06:44 AM
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im pretty sure its a 1 1/4 banjo bolt.the most important thing is when your pulling the pump out,the cam driven plunger on the bottom can slideout of the pump and fall in the engine.be very careful with this,it can be catastrophic if it happens.also youhave to be just as careful putting the new one back in.itcan be a pain to do with the turbo pedistol,mainlythat banjo bolt,you may have to mod the wrench a bit.goodluck>>>>>>brian

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post #6 of 13 Old 03-23-2010, 06:59 AM
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Yea, 1 1/4 Sorry.


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post #7 of 13 Old 04-01-2010, 06:56 PM
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What is it about this plunger that makes it so easy to fall off into the motor?

Last edited by CPD4thD; 04-01-2010 at 07:25 PM.
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post #8 of 13 Old 04-09-2010, 06:21 PM
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Originally Posted by CPD4thD View Post
What is it about this plunger that makes it so easy to fall off into the motor?
when you lift the pump out ,the plunger sometimes slide right out of the pump and can find its way around the camshaft into the engine.

96 F250 460-auto-ext.cab-long box-4.10-152k-10mpg all day running or not.....

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post #9 of 13 Old 04-10-2010, 11:19 AM
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Hey is there any way to know when the pump is getting weak? Mines leaking a little but dont really know if it is getting weak or not. Its not really leaking enough to change it yet, but it wouldnt hurt anyway. Thanks

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post #10 of 13 Old 04-10-2010, 08:49 PM
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Originally Posted by lil o rinny View Post
Hey is there any way to know when the pump is getting weak? Mines leaking a little but dont really know if it is getting weak or not. Its not really leaking enough to change it yet, but it wouldnt hurt anyway. Thanks
If it leaks it's weak. You're losing pressure to the injectors.

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