Fuel Issue (feel like it's common)
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Fuel Issue (feel like it's common)
First post,
I got a 92' w/ the 302 EFI 5.0 and it had 171,000 miles on the odometer.
after 6 months i'm at 174,000+ miles and ran into a fuel issue.
The truck started bogging down while driving due to a lack of fuel.
I switched to the front fuel tank and the problem was resolved.
I drove on one tank for a month and reluctantly switched to the rear tank.
The truck drove me to my destination with no issues.
When leaving my destination the issue ensued, but now with BOTH tanks.
I have replaced the fuel pressure regulator AND the fuel filter, and the problem still exist.
When I switch the key in the on position, the fuel pump primes, but at a lower tone than before.
When I switch between the two tanks, both prime when trying to start.
Also when the pumps were primed, I checked the release valve on the fuel rail, and only air with a slight bit of gas came out.
Any information would be appreciated.
Thank you
I got a 92' w/ the 302 EFI 5.0 and it had 171,000 miles on the odometer.
after 6 months i'm at 174,000+ miles and ran into a fuel issue.
The truck started bogging down while driving due to a lack of fuel.
I switched to the front fuel tank and the problem was resolved.
I drove on one tank for a month and reluctantly switched to the rear tank.
The truck drove me to my destination with no issues.
When leaving my destination the issue ensued, but now with BOTH tanks.
I have replaced the fuel pressure regulator AND the fuel filter, and the problem still exist.
When I switch the key in the on position, the fuel pump primes, but at a lower tone than before.
When I switch between the two tanks, both prime when trying to start.
Also when the pumps were primed, I checked the release valve on the fuel rail, and only air with a slight bit of gas came out.
Any information would be appreciated.
Thank you
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Did the unused tank, I believe the rear, mysteriously fill itself up during this time period? Your problem could be the all too common failed check valve in the rear tank. It can stick open enough that even though the front pump is running there is not enough fuel to run the engine. Most of it is diverted to the unused rear tank.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
No sir....the OP's 1992 has a high pressure pump in each tank. There is no external high pressure pump. Ford stopped using the fuel system you are describing after the 1989 model year on the F series trucks.
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Laughing Gas
Joined: Aug 2002
Posts: 1,069
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From: Central Wisconsin
I stand corrected....
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I disconnected the fuel pump connector at the tank and checked power at the connector with a volt meter KOEO and had 6.6 volts this matched what was at the inertia switch. I get 10.6 volts engine cranking. I then sent 12 volts into the pump to see if the pump would start (red&orange wires)and nothing happened at the front tank and the rear tank pump clunks but doesn't run. I am going to drop the front tank and have a look with a new pump on hand.
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