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Tractor Talk Discussion Forum

Replacing Mechanical Fuel Pump

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Tweeter

12-11-2005 09:27:07




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When I replace the mechanical fuel pump on my Ford F250 351 engine, do I have to pay extreme attention to how the old one came out or will the new one slide back in only one way? Or is the procedure more like say the procedure for removing and replacing the distributor?




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doogdoog

12-11-2005 11:58:14




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 Re: Replacing Mechanical Fuel Pump in reply to Tweeter, 12-11-2005 09:27:07  
Aloha, Don't forget if it uses a gasket,clean off the old gasket and install a new one.

Mahalo,
doogdoog



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old

12-11-2005 10:54:47




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 Re: Replacing Mechanical Fuel Pump in reply to Tweeter, 12-11-2005 09:27:07  
You do have to watch to make sure you get it in the right way or it wil brake the new pump when you try to start the engine. The other guys have it right also about the cam lob



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Tweeter

12-11-2005 11:07:44




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 Re: Replacing Mechanical Fuel Pump in reply to old, 12-11-2005 10:54:47  
My truck is rated at 8600 lbs and I noticed that the parts stores sell fuel pumps for over 8500# and under 8500#. If it is the same motor what is the difference?



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old

12-11-2005 11:17:20




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 Re: Replacing Mechanical Fuel Pump in reply to Tweeter, 12-11-2005 11:07:44  
The higher rated truck also need a higher rated fuel pump to deliever more fuel. Something about if you pull a heavyer load you need to have more fuel to do so. So yes if yours is rated higher you will also need the higher rated pump.



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Keith-OR

12-11-2005 12:02:35




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 Re: Replacing Mechanical Fuel Pump in reply to old, 12-11-2005 11:17:20  
Old, it makes no difference on the pump, Just depends what part of the country you are in, cause they don't even ask that question here. I just put a new pump on my 1 ton Ford, it has the same part # as my 3/4 Ford with same motor. And it did not even make a difference between 4bbl and 2 bbl carb.... Just my experience

Keith



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old

12-11-2005 12:10:29




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 Re: Replacing Mechanical Fuel Pump in reply to Keith-OR, 12-11-2005 12:02:35  
Might be right there but I figure if its rated higher you should go with the higher one. He might be ok with the other one but why chance it.



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John T

12-11-2005 10:02:15




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 Re: Replacing Mechanical Fuel Pump in reply to Tweeter, 12-11-2005 09:27:07  
Tweeter, I dont recall anything particular or special in the ones I changed over the years, it sort of depends on where the cam lobes located as to how much tension n how hard they may be to squeeze into position. On some, but I forget if thats Chevy or Ford???? the plunger pin (that actually moves the fuel pump lever arm) has to get pushed up in its bore to get the pumps lever arm into the right place. If theres any short sections of rubber line attached to the pump I like to replace them when changing out a pump.

John T

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Keith-OR

12-11-2005 11:21:40




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 Re: Replacing Mechanical Fuel Pump in reply to John T, 12-11-2005 10:02:15  
John that is chev that has the plunger. There is a bolt in the front you had to remove and put in a longer bolt one to hold plunger up in place. If not was a real bit_h to push plunger back up and install fuel pump...:>) :>)

Keith



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Hoosier JD

12-11-2005 17:57:46




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 Re: Replacing Mechanical Fuel Pump in reply to Keith-OR, 12-11-2005 11:21:40  
If you have to replace one without the bolt and are having trouble keeping the rod up in the block, just put a little grease around it, that will hold it while you install the pump..... an old trick I"ve used on many different situations over the years. Good luck, Mike.



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Keith-OR

12-11-2005 18:47:36




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 Re: Replacing Mechanical Fuel Pump in reply to Hoosier JD, 12-11-2005 17:57:46  
In 45 years never seen a small block chev that did not have the hole in front to put in bolt to hold fuel pump rod in place, excluding the new Vortec. The older chev blocks it was used for the front motor mounts. I could be wrong but never run in to this. If the rod comes clear down, it lodges up against fuel pump mounting plate. Then it is almost impossible to get it pushed back up, the only way to push it back up is to remove the pump mounting plate off side of engine. Been there done that when I was young and foolish....:>):>)

Keith

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John T

12-11-2005 11:45:37




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 Re: Replacing Mechanical Fuel Pump in reply to Keith-OR, 12-11-2005 11:21:40  
Thanks, I knew it was one of them.

John T



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Bob

12-11-2005 10:00:23




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 Re: Replacing Mechanical Fuel Pump in reply to Tweeter, 12-11-2005 09:27:07  
It helps if the engine is turned so that the fuel pump lever is on the "low" side of the cam. If you loosen the fuel pump and there's lots of pressure trying to "cock" the housing, try rotating the engine (by hand), a bit, putting the pump lever on the low side of the cam.

Make sure the new pump lever matches the old one exactly, and install it carefully, and you shouldn't have any problems.

Put a dab of light lithium grease on the wear area of the lever to lube it for startup.

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