Fuel tank modification availability ?
Posting Guru
Joined: May 2002
Posts: 1,495
Likes: 2
From: Northwest Fl
There may be other options available but when I was setting my 55 up for efi, I cut the lock-ring assembly out of the 89 f150 gas tank and modified my stock 55 gas tank to accept it. It involved cutting the ring out about 1" larger all the way around the 89 lock ring and cutting a smaller hole in the top of the 55's tank and soldering it in. I have an access hole in the floorboard so when I need to get to it, I can. I wanted to be able to buy stock parts anywhere, anytime so this worked for me. I will add a photo to my gallery.
Lead Driver
Joined: Apr 2002
Posts: 8,813
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From: Littleton, New Hampshire
Originally Posted by Joe T.
Does anyone have info on modifying or purchasing parts to put an electric fuel pump for a fuel injected motor in a '55 f100 stock gas tank ? Thanks, Joe
Vern
Posting Guru
Joined: May 2002
Posts: 1,495
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From: Northwest Fl
That is a good question, don't know why Ford used two pumps, low pressure in the tank and a high pressure pump on the rail. If you can go with just one pump, you will still have to run a return line to the tank with efi.
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Senior User
Joined: Jan 2006
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I do know that having the pump right at the pick up point where it is pushing the fuel is the most efficient way of doing it. I'm installing a tuned port motor so it has to run around 44psi. I'd bet Ford used a low pressure in the tank so the high pressure pump didn't lose efficiency having to suck up fuel also. If anyone knows of an external pump that would meet the pressure needs that would be great. It also runs (I believe) when the computer tells it to so amperage draw may be a deciding factor also.
Last edited by Joe T.; Jun 18, 2006 at 03:21 PM.
Lead Driver
Joined: Apr 2002
Posts: 8,813
Likes: 13
From: Littleton, New Hampshire
I'm certainly no expert in electric fuel pumps but it seems to me that drag racers use an adjustable pump that surely would meet your needs. I'd check into something like that. I have no idea on the amperage draw or if it would be a factor.
Vern
Vern
Senior User
Joined: Oct 2005
Posts: 201
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From: Churchville, VA
I think a later model Ranger pump is what you are looking for. I read it somewhere on here, maybe a search would help?
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Hotshot
Joined: Oct 2004
Posts: 15,882
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From: Durham NC
The electric fuel pumps used by drag racers are high volume low pressure models. You can't use a lot of pressure on carbs without blowing the float needles off their seat. To get enoght pressure required for EFI, an external pump would not be very practical since it would have to be very large or would overheat the pump/fuel. That's one reaso the pump is located in the tank, the gas acts as cooling and it is much more efficient to push the fuel at high pressure than to try to suck it. EFI also requires a return line to the tank. Note: if using an in tank pump, do NOT bypass the low fuel safety switch on the pump. Allowing the pump to run with not enough fuel to keep it cool would be like lighting a fuse running into the tank!
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