| Added dual fuel pumps [message #342028] |
Thu, 28 March 2019 09:26  |
 |
RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
|
Senior Member |
|
|
Hi all,
I removed the fuel tank selector valve and installed dual fuel pumps. The wire that operated the valve now operated a relay to switch power to the desired fuel pump. The fuel pumps have a built-in check valve so the fuel does not flow back through the other pump.
Tested and all seems to work as designed!
One thing I will change is the power wire to the fuel pumps. I have a Howell EFI wiring harness. The power wires are only #18 and I have lots of #14 wire. I'll check the voltage drop across the existing wires just for fun.
Here is a couple of pics.
http://www.gmcmhphotos.com/photos/g7210-dual-fuel-pumps.html
Here is a PDF on the importance of proper fuel pump voltage:
http://www.gmcmhphotos.com/photos/dual-fuel-pumps/p66136-the-importance-of-proper-fuel-pump-voltage-tsb.html
I know the brass T is hitting the hole in the frame. I'll put a section of rubber hose on it to prevent rubbing.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
|
|
|
|
| Re: Added dual fuel pumps [message #342029 is a reply to message #342028] |
Thu, 28 March 2019 10:08  |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
|
Senior Member |
|
|
Thanks Bruce,
this is in my near future. I am waiting for it to warm up just a little more. I have some hopes and dreams of having them outside the frame rail for easier service/checking, and fabricate up a guard that doubles as some more sound protection, but I have a feeling once I get the coach jacked up and get looking under the coach, I will end up with something very similar to your setup.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
|
|
|
|
| Re: [GMCnet] Added dual fuel pumps [message #342030 is a reply to message #342028] |
Thu, 28 March 2019 10:22 |
Dave Stragand
Messages: 307
Registered: October 2017
Karma: 0
|
Senior Member |
|
|
Bob and Bruce,
Do either of you have a wiring diagram showing your wiring from the
existing selector switch, the EFI fuel pump relay power feed, and the
relay(s) at the pumps? That would be very helpful for me & others.
Thanks,
-Dave
1978 Transmode near Pittsburgh
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of
Bruce Hislop via Gmclist
Sent: Thursday, March 28, 2019 10:26 AM
To: gmclist@list.gmcnet.org
Cc: Bruce Hislop
Subject: [GMCnet] Added dual fuel pumps
Hi all,
I removed the fuel tank selector valve and installed dual fuel pumps.
The wire that operated the valve now operated a relay to switch power to
the
desired fuel pump. The fuel pumps have a built-in check valve so the
fuel does not flow back through the other pump.
Tested and all seems to work as designed!
One thing I will change is the power wire to the fuel pumps. I have a
Howell EFI wiring harness. The power wires are only #18 and I have lots
of #14
wire. I'll check the voltage drop across the existing wires just for
fun.
Here is a couple of pics.
http://www.gmcmhphotos.com/photos/g7210-dual-fuel-pumps.html
Here is a PDF on the importance of proper fuel pump voltage:
http://www.gmcmhphotos.com/photos/dual-fuel-pumps/p66136-the-importance-
of-proper-fuel-pump-voltage-tsb.html
I know the brass T is hitting the hole in the frame. I'll put a section
of rubber hose on it to prevent rubbing.
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
1978 Transmode (403)
Pittsburgh, PA
|
|
|
|
|
|
| Re: Added dual fuel pumps [message #342032 is a reply to message #342028] |
Thu, 28 March 2019 11:07 |
|
RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
|
Senior Member |
|
|
Dupicated message for some reason!
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
[Updated on: Thu, 28 March 2019 11:09] Report message to a moderator |
|
|
|
| Re: Added dual fuel pumps [message #342048 is a reply to message #342028] |
Thu, 28 March 2019 19:12 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
I've an MSD Atomic going back on my new engine... but I didn't care for its performance at all on the now dead motor. I attributed the problems to the engine itself, in that certainly all their users don't get this result. I shall counsel with them.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
