How to change a fuel pump on a 89 Ford F350 - 460 Ford Forum
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post #1 of 9 (permalink) Old 10-26-2011, 09:53 AM Thread Starter
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How to change a fuel pump on a 89 Ford F350

Truck wont start! I think its the fuel pump. Which pump usually goes bad the one in the tank or the one on the frame. and where is the one in the tank located please help!!!
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post #2 of 9 (permalink) Old 10-26-2011, 08:18 PM
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Originally Posted by rjtrudeau View Post
Truck wont start! I think its the fuel pump. Which pump usually goes bad the one in the tank or the one on the frame. and where is the one in the tank located please help!!!
to find the pump in the tank ... look in the tank !
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post #3 of 9 (permalink) Old 10-26-2011, 08:33 PM
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to find the pump in the tank ... look in the tank !
LMAO! Sorry had to laugh about that one. But seriously pull the easiest one first and check it then move on to the in tank pumps.

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post #4 of 9 (permalink) Old 10-26-2011, 08:54 PM
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Usually when a pump goes bad you can hit it or hit the tank and it will start but that is usually the last time it will get you home and then have to replace it. I'm surprised that there are 2 pumps? The one on the frame is usually a filter? But I could be wrong.

D

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post #5 of 9 (permalink) Old 10-26-2011, 09:43 PM
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Disconnect the fuel line, stich it in an empty bottle, turn on the key, do you get gas?
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post #6 of 9 (permalink) Old 10-28-2011, 08:55 AM
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Originally Posted by Dman64 View Post
Usually when a pump goes bad you can hit it or hit the tank and it will start but that is usually the last time it will get you home and then have to replace it. I'm surprised that there are 2 pumps? The one on the frame is usually a filter? But I could be wrong.

D
Some trucks had three pumps one in each tank that produce low pressure and one on the frame near the filter to boost pressure and a electric tank selector switch, or some just have in tank pumps with an automatic tank selectors. There is no rhyme or reason to why they went with one versus the other so on many truck you have to investigate which way the system is setup.

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post #7 of 9 (permalink) Old 10-28-2011, 09:52 AM
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These trucks are notorious for having the tank selector go bad and cut fuel to the motor. Usually one tank will still work though. It is the other that will cut the fuel supply off when it is selected. Just something to check if you have not already tried to run it on either tank.

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post #8 of 9 (permalink) Old 10-28-2011, 08:13 PM
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Originally Posted by MrScharfenberger View Post
These trucks are notorious for having the tank selector go bad and cut fuel to the motor. Usually one tank will still work though. It is the other that will cut the fuel supply off when it is selected. Just something to check if you have not already tried to run it on either tank.
I forgot about that Chris, when my tank selector took a crap it would pump all the fuel out of the front tank and return it to the rear which of course leaked LOL.

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post #9 of 9 (permalink) Old 10-28-2011, 11:46 PM
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Originally Posted by bigblok86ranger View Post
I forgot about that Chris, when my tank selector took a crap it would pump all the fuel out of the front tank and return it to the rear which of course leaked LOL.

I have had that happen a few months back on my 86 like to have drove me crazy before I figured it out.

On the dual tank ford used the low pressure pumps to change tanks the tank selector in dash just cut off one of the pumps and start the other just depends on what tank you switch it to.The high pressure pump on the frame is for the injection system.
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