GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » Did you do Fuel Injection?
Did you do Fuel Injection? [message #264075] Sun, 12 October 2014 21:23 Go to next message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
Senior Member
Did you do Fuel Injection? I'm going to put fuel pumps in the tank. If you did FI, how did you return fuel to the tank?

Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.

Report message to a moderator

Re: Did you do Fuel Injection? [message #264091 is a reply to message #264075] Sun, 12 October 2014 23:05 Go to previous messageGo to next message
djeffers is currently offline  djeffers   United States
Messages: 219
Registered: June 2004
Karma: 2
Senior Member
Larry,

We are doing an in-tank fuel pump system.

We are using electric fuel tank selector valves to return the fuel to the tank we are pumping from.

The fuel pumps have check valves, so no supply tank selector valve is needed.

Regards,

Don and Susan Jeffers
78 Eleganza II Cad 500 EFI

Report message to a moderator

Re: Did you do Fuel Injection? [message #264092 is a reply to message #264075] Sun, 12 October 2014 23:08 Go to previous messageGo to next message
hal kading is currently offline  hal kading   United States
Messages: 642
Registered: February 2004
Location: Las Cruces NM
Karma: 4
Senior Member
Larry,

My EFI fuel return is into the filler pipe. After the level is down below where the fuel transfers from tank to tank it seems to all go to the rear tank as reported by Matt. Rear tank is the aux on my stretch. Once the mains (2 interconnected) are low I still have 7 gallons left in the rear aux.

Hal Kading 78 Buskirk Las Cruces NM

Report message to a moderator

Re: Did you do Fuel Injection? [message #264108 is a reply to message #264075] Mon, 13 October 2014 07:22 Go to previous messageGo to next message
midlf is currently offline  midlf   United States
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
Senior Member
Larry wrote on Sun, 12 October 2014 21:23
Did you do Fuel Injection? I'm going to put fuel pumps in the tank. If you did FI, how did you return fuel to the tank?


Not FI but I use low pressure in tank pumps to transfer fuel to a 1 gallon surge tank. From there I pump to the carb. Return from the carb to the surge tank. Return from the surge tank to a return line installed in the fuel sender mount on the aux tank. That way aux tank is always as full as possible. The return tube extends to just above the floor of the tank to eliminate splash.

I used the surge tank for two reasons. 1: If I ever installed FI I would only have to change the pump on the surge tank. 2: with the flat tanks possibly causing the pickup to go dry the surge tank gives me time to recover. This is not so important with a carb but can be critical with FI.

Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI

Report message to a moderator

Re: Did you do Fuel Injection? [message #264250 is a reply to message #264075] Tue, 14 October 2014 17:04 Go to previous message
lotsofspareparts is currently offline  lotsofspareparts   United States
Messages: 726
Registered: May 2014
Location: Arlington, WA
Karma: -9
Senior Member
FI Return line runs to the filler pipe on my coach also, really easy to reach through the hatch as well.

Jared

Jared & Tina Lazaron + 14yr old Daughter..... 77 Eleganza II "Recherché"..... 73 Canyon Lands 230 "Elephant"

Report message to a moderator

Previous Topic: [GMCnet] Water leaks
Next Topic: Re: [GMCnet] 403 engine for sale
Goto Forum:
  


Current Time: Wed Oct 02 20:24:52 CDT 2024

Total time taken to generate the page: 0.01837 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software