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Re: [GMCnet] Carter 4070 electric fuel pump plumbing [message #261476 is a reply to message #261475] Wed, 10 September 2014 07:37 Go to previous messageGo to previous message
Mr ERFisher is currently offline  Mr ERFisher   United States
Messages: 7117
Registered: August 2005
Karma:
Senior Member
On Wednesday, September 10, 2014, Kerry Pinkerton
wrote:

> 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.
>
>
One problem with the mechanical pumps is
THEY SUCK
which aggravates the problem with the new fuels
Better to push.

Wonder why all modern systems are ALL electric pumps ???

Erf

>
> 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
>
>
> 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, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, Manny Brakes, 1 ton, tranny also a 76
> Eleganza to be re-bodied as an Art Deco car hauler
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
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