Fuel Pump/Fuel Relay problems
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Joined: Feb 2004
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Fuel Pump/Fuel Relay problems
Hi
I have an 85 F-250 with the 460 and an edelbrock carberator. My problem is that for some reason, when the truck sits for a couple of days, the gas seems to leak back down to the tank (can't see any leaks). The next time I try to start it, I have to crank it for about 30-60 seconds to get the gas back up to the carb.
My father-in-law has almost the exact same truck and his fuel pump turn on when the ignition is on, but mine doesn't turn on unless the engine is turning. I would like to either find out why the fuel drains back or set up the fuel pump to turn on when the key is on to charge the fuel system. Any help would be appreciated.
Thanks
I have an 85 F-250 with the 460 and an edelbrock carberator. My problem is that for some reason, when the truck sits for a couple of days, the gas seems to leak back down to the tank (can't see any leaks). The next time I try to start it, I have to crank it for about 30-60 seconds to get the gas back up to the carb.
My father-in-law has almost the exact same truck and his fuel pump turn on when the ignition is on, but mine doesn't turn on unless the engine is turning. I would like to either find out why the fuel drains back or set up the fuel pump to turn on when the key is on to charge the fuel system. Any help would be appreciated.
Thanks
Posting Guru
Joined: May 2003
Posts: 1,242
Likes: 3
From: Joliet, Illinois
There is a fusable link at the starter relay that supplies power to the fuel pump when cranking the engine as there is a relay (fuel pump cut off relay) that needs oil pressure to keep the fuel pump operating while the engine is running.
If it is blown, you need to crank until there is enough oil pressure to turn the fuel pump on.
If it is blown, you need to crank until there is enough oil pressure to turn the fuel pump on.
Senior User
Joined: Feb 2004
Posts: 105
Likes: 0
From: North Carolina
I had the same problem with my 86, there is a pink wire with black stripe that is supposed to be hot during cranking, conects to the starter relay with a fusable link. After the engine starts, power is pulled through the oil pressure switch.
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