Here's the URL to reach the wiring diagram Kerry mentioned. The photos of
my installation are no longer accurate. I later moved the pumps to the
outside of the left frame rail and positioned the filters correctly before
the pumps.
http://www.gmcmhphotos.com/photos/dual-electric-fuel-pumps-wiring-to-select-fuel-tank/p34379-dual-electric-fuel-pumps-to-eliminate-selector-valve.html
The return line photos need some explanation: My fuel line going forward
terminates in a homemade (10" x 12" aluminum pipe with welded end plates
and appropriate tapped holes) fuel accumulator. The return line to the
bottom of the Aux tank comes from that accumulator. The feed to the
carburetor was from the bottom of that device until I added EFI. Now, its
high pressure pump is fed from, and the return from the TBI regulator goes
into, that accumulator. I don't have vapor lock problems. And can replace
the pumps without dropping the tanks. (dig...dig)
Ken H.
On Mon, Apr 17, 2017 at 8:27 AM, Kerry Pinkerton
wrote:
> I followed Ken Henderson's advice and removed the selector valve, ran two
> pumps with filters between the pumps and tanks and check valves after each
> pump. They are mounted outside the frame. I'm using the old tank switch
> on the dash with some relays to select which switch (tank) is in use. I
> also have a line running from a oil pressure switch that kills power to
> the relays and therefore shuts off the fuel pump if the engine loses oil
> pressure. In the I believe Ken posted a schematic somewhere in his
> albums. The only thing I did different was put an emergency fuel switch on
> the
> dash. If the engine were to loose oil pressure in the middle of an
> intersection or somewhere similar and I want to risk the engine in order to
> get to
> a save place, I can turn on the emergency switch, start the engine, and
> move the coach. I also use it as a fuel primer once in a while.
>
> Oh, and the mechanical pump is removed and blocked off. I believe two
> electric pumps is sufficient backup. Not to mention the extra 12 MPG I get
> because I'm not operating the fuel pump......
>
> I have a drawing in the coach I think.
> --
>
my installation are no longer accurate. I later moved the pumps to the
outside of the left frame rail and positioned the filters correctly before
the pumps.
http://www.gmcmhphotos.com/photos/dual-electric-fuel-pumps-wiring-to-select-fuel-tank/p34379-dual-electric-fuel-pumps-to-eliminate-selector-valve.html
The return line photos need some explanation: My fuel line going forward
terminates in a homemade (10" x 12" aluminum pipe with welded end plates
and appropriate tapped holes) fuel accumulator. The return line to the
bottom of the Aux tank comes from that accumulator. The feed to the
carburetor was from the bottom of that device until I added EFI. Now, its
high pressure pump is fed from, and the return from the TBI regulator goes
into, that accumulator. I don't have vapor lock problems. And can replace
the pumps without dropping the tanks. (dig...dig)
Ken H.
On Mon, Apr 17, 2017 at 8:27 AM, Kerry Pinkerton
wrote:
> I followed Ken Henderson's advice and removed the selector valve, ran two
> pumps with filters between the pumps and tanks and check valves after each
> pump. They are mounted outside the frame. I'm using the old tank switch
> on the dash with some relays to select which switch (tank) is in use. I
> also have a line running from a oil pressure switch that kills power to
> the relays and therefore shuts off the fuel pump if the engine loses oil
> pressure. In the I believe Ken posted a schematic somewhere in his
> albums. The only thing I did different was put an emergency fuel switch on
> the
> dash. If the engine were to loose oil pressure in the middle of an
> intersection or somewhere similar and I want to risk the engine in order to
> get to
> a save place, I can turn on the emergency switch, start the engine, and
> move the coach. I also use it as a fuel primer once in a while.
>
> Oh, and the mechanical pump is removed and blocked off. I believe two
> electric pumps is sufficient backup. Not to mention the extra 12 MPG I get
> because I'm not operating the fuel pump......
>
> I have a drawing in the coach I think.
> --
>
