Electric fuel pump
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Electric fuel pump
Guys, is it possible for an electric fuel pump to be insufficient to power my engine?
Some back ground about what's going on. 85 F250 with a 460 BBF with a C6 transmission 4x4. It has a Holley 650CFM carb as well. The truck runs and drives great, however, (going up hills mostly) it will cut out and die from time to time. It has a clear fuel filter on it and a new non see through filter as well. The clear is clean. It also has an electric fuel pump (6-8psi).
When it dies, the clear filter looks empty, but the truck always starts back up. So is it possible that this fuel pump is too small for a 460? Or what else could be happening?
Some back ground about what's going on. 85 F250 with a 460 BBF with a C6 transmission 4x4. It has a Holley 650CFM carb as well. The truck runs and drives great, however, (going up hills mostly) it will cut out and die from time to time. It has a clear fuel filter on it and a new non see through filter as well. The clear is clean. It also has an electric fuel pump (6-8psi).
When it dies, the clear filter looks empty, but the truck always starts back up. So is it possible that this fuel pump is too small for a 460? Or what else could be happening?
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From: Virginia
Where is the fuel pump located? Does this truck have a modified exhaust? It is possible(have had it happen to me) that the fuel line is too close to an exhaust pipe underneath. This problem will be aggravated if the pump is up front sucking the fuel forward.
I have also seen people use lots of rubber fuel line when the modify the fuel system, and it can get soft and suck shut restricting the fuel flow.
The factory ran the exhaust on the pass side, and the fuel lines on the driver's side. They also had a special system on the 460 trucks to eliminate this problem.
I have also seen people use lots of rubber fuel line when the modify the fuel system, and it can get soft and suck shut restricting the fuel flow.
The factory ran the exhaust on the pass side, and the fuel lines on the driver's side. They also had a special system on the 460 trucks to eliminate this problem.
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It's metal line up to the front of the oil pan then it's about 3 inches of rubber, then fuel pump, then about a foot of rubber again to the filter and carb. As for the exhaust being close, with it being metal line in that area, would that still cause an issue?
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From: Virginia
Yes, being near the exhaust can cause a problem. If you could put some sort of shield between the line and the exhaust, you could see if the problem went away. On the truck I had I ended up re-routing the line on the outside of the frame and the problem went away.
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Ok so I looked and there's a good 3 inches between fuel line and exhaust. Would that be too close?
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From: Virginia
In my experience yes it was too close. I will have to admit though, mine only konked out when I got in town and it didn't have much air flow under the truck.
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From: Virginia
Sounds about right. Low airflow lets it heat up quicker around the exhaust.
Elder User
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From: Ashland
I'm surprised no one even asked this... What brand/model electric fuel pump? Doesn't matter what the pressure is if it doesn't flow enough gas to keep up with the usage.
You mentioned that your fuel pump is more or less in the engine bay. There are 2 types of fuel pumps.. ones that push fuel, and ones that suck fuel. The cheaper fuel pumps push fuel so if there is not a steady supply of fuel right at the fuel pump, it will starve, which also in turn could damage the fuel pump. You can find fuel pumps that suck the fuel, but they are expensive.
You need to move that fuel pump at or right near the tank. Will definitely help keep a constant supply of fuel to your engine.
You mentioned that your fuel pump is more or less in the engine bay. There are 2 types of fuel pumps.. ones that push fuel, and ones that suck fuel. The cheaper fuel pumps push fuel so if there is not a steady supply of fuel right at the fuel pump, it will starve, which also in turn could damage the fuel pump. You can find fuel pumps that suck the fuel, but they are expensive.
You need to move that fuel pump at or right near the tank. Will definitely help keep a constant supply of fuel to your engine.
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It's a Mr gasket brand. It was on the truck when I got it so I don't know the model but that problem (pump so far from the tank) was in my head but I didn't think that would matter.. that would explain why the clear filter looks empty most of the time.
Elder User
Joined: Sep 2014
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From: Ashland
I slept at a Holiday Inn Express once..
Actually I've been doing a lot of research on electric fuel pumps to replace my mechanical one. 
