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Re: Carter 4070 electric fuel pump plumbing [message #261475 is a reply to message #261471] Wed, 10 September 2014 06:53 Go to previous messageGo to previous message
kerry pinkerton is currently offline  kerry pinkerton   United States
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma:
Senior Member
Ken Burton wrote on Wed, 10 September 2014 05:11
...If total electric is your thing, then I like Ken H's installation. He has 2 P4070's (one for each tank). If his electric pump fails then he can switch tanks and pumps to keep going.


Because of vapor lock, this is what I did. The wife freaks if the coach stumbles like it did in Branson.

I used the Airtex pump (in stock at the local Advance) and installed them outside the frame with check valves. I did NOT drop the tanks because the PO had had them dropped and new rubber ethanol rated gas line installed. I did keep the rubber lines as short as possible. In addition to the low oil cutoff and the relays to power the pumps, I wanted an EMERGENCY fuel pump overide/prime switch. I can envision situations where I'm willing to risk my engine a few more seconds with no oil pressure to get out of the middle of an intersection, off a railroad track, or similar. Starting is instantaneous.

The old tank selector is not used but the switch now controls the relays to determine which pump runs. Check valves after the pumps to prevent back pressure and gas filters in front of them, and another up by the engine, and the one in the Paterson carb. Probably over filtered.

Somehow I never took any photos of the installation ... I do have this shot of the cover I made to protect the pumps and lines from road trash. 1/8" aluminum bolted through the frame and through the aluminum rocker extrusion. The two holes allow access to the pump wiring and was cut with a 2 1/2" hole saw. The ends are open for ventilation

http://www.gmcmhphotos.com/photos/misc/p55854-fuel-pump-cover.html
http://www.gmcmhphotos.com/photos/data/6256/Fuel_pump_cover.jpg

Because I'm chicken and new to this setup. I did not remove the newer mechanical pump and put on a block off plate. Instead, I just made a loop from rubber gas line and hooked the input to the output. If something goes nuts with my electric pumps on the way to Wisconsin, I can switch back to the mechanical pretty easy.

Not saying it's right or the best it's just what I did.

Kerry Pinkerton - North Alabama Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L

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