73' fuel problems!!HELP!

73blue4x · 06-23-2008, 06:38 PM

For some reason which i cannot figure out, i cant get my truck to run off of the fuel tanks. Both tanks are full. When i run the pump rite out of a gas can it works perfectly. Both the tanks are hooked up to an aftermarket fuel tank selector valve. It is hooked up correctly as far as I know. It clicks when I hit the switch in the cab. I am also having problems with the fuel gauge not working. I have the stock wiring harness for the solenoid. It plugs in under the dash and then from there back a wire plugs onto each tank sending unit and another wire goes to the solenoid. Someone please help! Thank you!

87c10slammer · 06-23-2008, 07:24 PM

clog in tank filter. did you install an aftermarket inline pump?

leolkfrm · 06-23-2008, 07:31 PM

try hooking one tank direct to eliminate the tank valve. sound like the valve is allowing air.

73blue4x · 06-23-2008, 10:50 PM

I will take a look at the filter and ill try hooking it directly. It has a stock pump.

Chevy_Finatic79 · 06-24-2008, 07:50 AM

here's a little trick I just had to use on a 72' burban I resurrected that did the same thing but only one tank. the rubber lines from the tank to the metal lines were rotted and had allowed air as someone above mentioned.

what I did was take my compressor and run air thru fuel supply line that in your case runs back to either tank when selected via the valve and if it is leaking you can hear the air hissing out and trace the problem that way.
I bet your rubber lines are dry rotted also
it's a cheap fix if that is your problem

mrjohnwayne · 06-24-2008, 08:53 AM

Ditto to cracked lines. I'm thinking it is letting in air somewhere too

73blue4x · 06-25-2008, 12:17 PM

I will check into that. Yesterday I by passed the solenoid and hooked directly to right side tank. Truck fired right up. That solenoid is brand new though. Any ideas? thanks.

leolkfrm · 06-25-2008, 12:21 PM

Just for kicks try hooking the left side , if no problems, the the lines should be good. then you need to recheck you connections at the selenoid cause that would be where your problems are

73blue4x · 06-25-2008, 09:42 PM

Does anyone have a schematic for all of the sending unit wiring and or just the fuel tanks them selves? thanks.

73blue4x · 07-13-2008, 03:00 PM

Ok. So I know both tanks work fine when bypassing the fuel tank selector valve. I am still having problems with my fuel gauge not reading as well. any other suggestions?

06-23-2008, 06:38 PM	#1
73blue4x Full Member Join Date: Mar 2008 Posts: 14	73' fuel problems!!HELP! For some reason which i cannot figure out, i cant get my truck to run off of the fuel tanks. Both tanks are full. When i run the pump rite out of a gas can it works perfectly. Both the tanks are hooked up to an aftermarket fuel tank selector valve. It is hooked up correctly as far as I know. It clicks when I hit the switch in the cab. I am also having problems with the fuel gauge not working. I have the stock wiring harness for the solenoid. It plugs in under the dash and then from there back a wire plugs onto each tank sending unit and another wire goes to the solenoid. Someone please help! Thank you! Last edited by 73blue4x; 06-23-2008 at 06:41 PM. Reason: left some stuff out

06-24-2008, 07:50 AM	#5
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 442	here's a little trick I just had to use on a 72' burban I resurrected that did the same thing but only one tank. the rubber lines from the tank to the metal lines were rotted and had allowed air as someone above mentioned. what I did was take my compressor and run air thru fuel supply line that in your case runs back to either tank when selected via the valve and if it is leaking you can hear the air hissing out and trace the problem that way. I bet your rubber lines are dry rotted also it's a cheap fix if that is your problem __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 5.7 Liter/THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

06-24-2008, 08:53 AM	#6
mrjohnwayne Moderator Join Date: Apr 2005 Location: Texas Posts: 3,220	Ditto to cracked lines. I'm thinking it is letting in air somewhere too __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

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06-23-2008, 07:24 PM	#2
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	clog in tank filter. did you install an aftermarket inline pump?

06-23-2008, 07:31 PM	#3
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 1,456	try hooking one tank direct to eliminate the tank valve. sound like the valve is allowing air.

06-23-2008, 10:50 PM	#4
73blue4x Full Member Join Date: Mar 2008 Posts: 14	I will take a look at the filter and ill try hooking it directly. It has a stock pump.

06-25-2008, 12:17 PM	#7
73blue4x Full Member Join Date: Mar 2008 Posts: 14	I will check into that. Yesterday I by passed the solenoid and hooked directly to right side tank. Truck fired right up. That solenoid is brand new though. Any ideas? thanks.

06-25-2008, 12:21 PM	#8
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 1,456	Just for kicks try hooking the left side , if no problems, the the lines should be good. then you need to recheck you connections at the selenoid cause that would be where your problems are

06-25-2008, 09:42 PM	#9
73blue4x Full Member Join Date: Mar 2008 Posts: 14	Does anyone have a schematic for all of the sending unit wiring and or just the fuel tanks them selves? thanks.

07-13-2008, 03:00 PM	#10
73blue4x Full Member Join Date: Mar 2008 Posts: 14	Ok. So I know both tanks work fine when bypassing the fuel tank selector valve. I am still having problems with my fuel gauge not reading as well. any other suggestions?