Fuel Pump Questions?
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Postmaster
Joined: Aug 2001
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From: Delaware
Fuel Pump Questions?
My electric fuel pump has been giving me flooding problems, so I decided I would hook up a mechanical fuel pump to see if the problems clear up.
I purchased a cheap replacement fuel pump for a 1979 F150 2wd for a 6.6L motor. My 400 has not had a mechanical pump since I have owned it.
The directions with the new pump don't specify how the pump is to be installed. I think that the fuel line connections should be 'down' near the oil pan.
The two connections are not marked either. One connection has a female fitting for connecting a hard line, the other is a 'hose' type connection.
Is the hard line the input from the fuel tank?
Is the hose connection the outlet to the carb?
I purchased a cheap replacement fuel pump for a 1979 F150 2wd for a 6.6L motor. My 400 has not had a mechanical pump since I have owned it.
The directions with the new pump don't specify how the pump is to be installed. I think that the fuel line connections should be 'down' near the oil pan.
The two connections are not marked either. One connection has a female fitting for connecting a hard line, the other is a 'hose' type connection.
Is the hard line the input from the fuel tank?
Is the hose connection the outlet to the carb?
Senior User
Joined: Nov 2003
Posts: 404
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From: Indiana
I'm pretty sure the hose connection is to the tank supply.The female is to the carb.From the factory Ford used a 5/16" hard line up to the distributor then they used 5/16" hose the rest of the way.What up with your electric pump?Do you have it regulated?I doubt that stock pump will supply enough fuel to your motor,it wouldn't on mine.
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Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
It is a Carter Electric pump. I have been using it for several years. It is regulated at 5 psi, and I have a fuel pressure gauge in front of the carb. Recently I noticed the motor was missing and running rich. The gauge was reading 6+ psi and pulsing. The pressure went back to 5 psi and the motor ran fine again for a while. Now the pressure is 6+ all the time.
I called Carter and they said that the regulator valve was probably sticking. Those pumps are not rebuildable either.
I will replace the electric pump as soon as I know for sure that it is the cause of the problem. I'll remove the mechanical pump and keep it and the plumbing handy for future problems.
I called Carter and they said that the regulator valve was probably sticking. Those pumps are not rebuildable either.
I will replace the electric pump as soon as I know for sure that it is the cause of the problem. I'll remove the mechanical pump and keep it and the plumbing handy for future problems.
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