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.

 

Hey Big Blue 94. I didn’t even know one could have both fuel pumps working at the same time, much less how to install them! Did you do it yourself? Maybe I should just let a pro do it... ?

 

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.

 

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.

 

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.

 

The original mechanical pump in my carb'd 83 lasted ~30 years. I think you are buying crappy fuel pumps or are having some other issue. I prefer simple and original unless there is some need. My Napa replacement pump has been great for the last 5 years.

Just an opinion

 

Dan 240 I am with you! I’d like to keep it as original as possible but since this would be the third pump, I just figured a change was needed. So no write ups on this topic?

 

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.