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Technical Forum (Read Only) => Computers, Fuel and Emissions => Topic started by: 87r10shorty on August 04, 2008, 03:02:31 pm

Title: Fuel System Schematics (and fuel gauge troubleshooting)
Post by: 87r10shorty on August 04, 2008, 03:02:31 pm

Anyone have a fuel line schematic for a dual tank setup on a 87?
Basically what I am trying to do is a dual tank to single tank conversion.
If any one has a write-up on how to do that, that would be great.

Title: Re: Fuel Line Schematic
Post by: Captkaos on August 04, 2008, 03:51:32 pm

If you are eliminating one of the tanks, just pull the switching valve off and connected the lines accordingly.  You will have a supply, return and Vent.  Use EFI rated hose though.

Title: Re: Fuel Line Schematic
Post by: 87r10shorty on August 05, 2008, 08:26:19 pm

I thought the power for the pumps ran through the switching valve, will the fuel pump still work with no valve in place?
I went ahead and unplugged the switching valve, and ran my lines together bypassing the valve. I tried to start the truck no joy. I don't even hear the fuel pump kick on. What is my next course of action.  While the lines were undone from the valve i went in to the cab turned the key and hit the tank selector switch, gas poured out of the valve, so i would guess the selector valve is good.

Title: Re: Fuel Line Schematic
Post by: VileZambonie on August 05, 2008, 10:14:00 pm

...

Title: Re: Fuel System Schematics (and fuel gauge troubleshooting)
Post by: Captkaos on May 14, 2012, 11:43:01 am

(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=23791.0;attach=19850;image)

(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=23791.0;attach=19852;image)

(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=23791.0;attach=19854;image)




(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=23791.0;attach=19856;image)



(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=23791.0;attach=19858;image)

Title: Dual tank wiring schematic
Post by: Irish_Alley on June 23, 2015, 11:15:19 pm

(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=9072.0;attach=29488;image)

Title: Re: Fuel System Schematics (and fuel gauge troubleshooting)
Post by: VileZambonie on September 23, 2017, 09:25:19 am

Dual Tank TBI Gauge
(https://drive.google.com/uc?id=0B8yVwIOnwzXXU0s3ZHRaRlhvbTQ)
Dual Tank TBI Relay
(https://drive.google.com/uc?id=0B8yVwIOnwzXXZFpCeThFejZhZW8)
Single Tank TBI Gauge
(https://drive.google.com/uc?id=0B8yVwIOnwzXXeWU3V1pDNEZCT0k)
Single Tank TBI Relay
(https://drive.google.com/uc?id=0B8yVwIOnwzXXc0dsUUtlTlhldU0)

Title: Re: Fuel System Schematics (and fuel gauge troubleshooting)
Post by: VileZambonie on October 01, 2018, 03:09:08 pm

Henry's drawing and post here http://forum.73-87chevytrucks.com/smforum/index.php?topic=36844.0;topicseen