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Home » Public Forums » GMCnet » Carter 4070 electric fuel pump plumbing
Carter 4070 electric fuel pump plumbing [message #261306] Mon, 08 September 2014 15:58 Go to previous message
Wayne is currently offline  Wayne   United States
Messages: 106
Registered: August 2004
Karma:
Senior Member
Hi everyone,
I am installing a 4070 Carter on the outside of the LH frame. The easy plumbing ( for me)would be to cut into the line in between the selector valve and mechanical fuel pump.The mechanical pump should pull gas tru the 4070 when the selector valve is off (rear tank). I intend to control it to work with the front gas tank only using current from the selector valve. I thought ( because the instructions say it is a pull tru pump the mechanical pump can pull the gas tru the electric pump even when the electric pump is off ( which will be most of the time in my case).
Then I was reading on Genes site , I think, that another GMCer did it this way and his fuel pressure went down to 3 lbs unless the 4070 was
on ( my 4070 WON'T BE ON most of the time). I can't see why there should be a pressure drop.

WHAT SAY YOU GUYS?

HERE IS WHAT I READ.

"I run the Carter 4070 on our GMC. I also have a fuel pressure gauge mounted on the outside of the windshield. When I first installed the electric pump I put it after the selector valve so I could opperate it with either tank. What I found was I had between 5 to 6 pounds of fuel pressure using the electic and mechanical pumps. When I shut off the electric pump the fuel pressure would drop down to 3 pounds. With the electric pump bypassed I was back up to 5 pounds.
I remounted the electric pump before the selector valve and connected it to the reserve tank only. That way if I need the electric pump I just switch to the reserve tank. This way there is no drop in fuel pressure while running on the main tank which is what I do."

Wayne Lawrence
76 Birchaven
Bellflower CA
w.lawrence@verizon.net

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