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Installing an electric fuel pump?

6.3K views 8 replies 5 participants last post by  Scoop  
#1 ·
I have a 1984 Bronco with a 351 double barrel carb that won't start. According to a mechanic, the problem is a bad mechanical fuel pump. If that's the case, this would be the third pump I need to replace in less than a year. I'd like to switch from the mechanical pump to an electric one. I've looked through various threads but haven't found anything useful on my own. Hope someone can help me find a thread on this. Thanks!!
 
#2 ·
My 85 is running both. Mechanical does the brute of the work, while the electric can be switched on if need be. They are inline, and the mechanical pump pulls through the electric even if it's not on.
 
#4 ·
It came to me that way. They simply spliced the line, and put a small Carter pump in there. It's wired to a permanent hot 12v switch in the cab. Not sure why they added it, unless they had problems with fueling in Colorado. Here in Kansas I never needed it, and left it off. The mechanical pump is able to pull through it. I'm also running a huge filter and -06 AN line from the electric pump all the way to the carb. Mechanical pump is in its normal place.
 
#5 ·
Totally doable, but you should remember: Electric fuel pumps absolutely suck at sucking fuel. When you install it, you'll need to install it in a location where it will never have a problem with fuel supply. I think even the better Carter rotary electric fuel pumps can only pull fuel 12" or so, so remember to install it where it won't be a problem even when you're going up a steep grade.
 
#6 ·
No clue what model mine is, but it is located on the frame rail, directly under the drivers seat. I used it to pump the bad gas out of my tank. Had plenty of flow, and never a problem. But that's just my experience with one single electric pump.
 
#9 ·
There's really not much to write up on an electric fuel pump install. The pump will come with some instructions. As stated mount it low on the crossmember just in front of the tank or on the frame rail. I used self tapping screws to mount the pump. Use some fuel hose to connect the fuel tank pick up outlet to the pump and then from the pump to the existing fuel hard line. Use hose clamps to secure the hoses. The electrical is probably the hardest part of the install. Connect the ground to one of the mounting screws when installing the pump. Find a keyed accessory power source in the dash and mount and connect a toggle switch. Run the power wire out the firewall and along a frame rail. Secure the wire with nylon ties.

As for the mechanical pump you can leave it in place (recommended) or remove it. You can get block off plates from most auto parts stores or online from Summit or Jegs. If you remove it you'll need to connect the inlet and outlet lines.

That's pretty much it. You should be able to do it in an hour or so.