Fuel pump relay wiring question
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Senior User
Joined: Nov 2004
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From: Indianapolis
Fuel pump relay wiring question
My 89 351W is not getting fuel. If I jumper the hot wire on the fuel pump relay, the pump runs. I can start and run the truck in this mode but fuel leaks on the ground.
I've read many of the posts around this topic and have grounded pin 6 on the DLC. With the key on and pin 6 grounded, the fuel pump does NOT run. The only way that I have been able to get the pump running is by jumpering the hot wire.
I read a post by subford that said "With pin#6 grounded and the key on the fuel pump will run all the time, if it does not then you have problems with the fuel pump or relay."
Is there a way to tell if it is indeed the relay?
Hunt4Fun
I've read many of the posts around this topic and have grounded pin 6 on the DLC. With the key on and pin 6 grounded, the fuel pump does NOT run. The only way that I have been able to get the pump running is by jumpering the hot wire.
I read a post by subford that said "With pin#6 grounded and the key on the fuel pump will run all the time, if it does not then you have problems with the fuel pump or relay."
Is there a way to tell if it is indeed the relay?
Hunt4Fun
Postmaster
Joined: Oct 2006
Posts: 4,816
Likes: 1
From: Davis & Newcastle, CA
Apply +12v to 85 pin on relay and ground the 86 pin, you should hear the switch in the relay **click**, if not then your relay is fried; replace the relay, cheap part and easy fix.
OBVIOUS NOTE: You'll need to remove the relay from the truck to test it... Just in case there was any confusion there...
OBVIOUS NOTE: You'll need to remove the relay from the truck to test it... Just in case there was any confusion there...
Thread Starter
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Senior User
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From: Indianapolis
It's too hot to fix the fuel leak, but I did test the relay. It was bad and with a new one in the fuel pump runs with the #6 pin grounded! 
On to the leak when it cools down some here.
On to the leak when it cools down some here.
Thread Starter
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Senior User
Joined: Nov 2004
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From: Indianapolis
Good point old paint! ROFL!
I've got the tool to separate the line. I'll be correcting it yet this week. Been rebuilding a roof on my old pop-up to get ready for deer season this fall.
This forum is the greatest!
ROFL!I've got the tool to separate the line. I'll be correcting it yet this week. Been rebuilding a roof on my old pop-up to get ready for deer season this fall.
This forum is the greatest!
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From: Indianapolis
Special thanks to subford, but thanks to everyone for your contributions to this forum. After 6 weeks of evenings and weekends (not all of them working on the truck), and lots of hours reading posts, my $250 89 F150 is running to beat the band!
Just took it for a spin for about 2 miles. Now to change the differential fluids, tranny, and transfer case and put on some new exhaust.
Much thanks to all!
Just took it for a spin for about 2 miles. Now to change the differential fluids, tranny, and transfer case and put on some new exhaust.
Much thanks to all!
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