New guy here... quick question for the pros - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smogrods · 12-22-2013, 09:12 PM

hey every one ive been lurking for a few weeks now and i came across something weird on my c-10.

I bought this 1970 c-10 lwb in oct

and have been tinkering on it getting it to a reliable driving state since. ive been rewiring the entire truck.

well when i was under it today i noticed it has 2 fuel tanks one in the cab and one under the bed.. as well as a selector switch that i only assume is a tank selector on the floor.

where is the fuel filler for the under bed tank?
please see my pics.

here is the tank selector switch (i think)

the cab tank

some shots of the under bed tank

some shots of the side of my truck.

Tinkermc · 12-22-2013, 09:24 PM

bet it fills from the tank in the cab, but if you work like a snake you can follow the filler neck if there is one.

Hawghauler · 12-22-2013, 09:44 PM

Sometimes with the underbed tanks, they put the filler in the bed. Sometimes in the driver's side tail light, sometimes in the driver's side rear clearance light, sometimes behind the rear license plate, and sometimes inside the rear wheel well. I'm surprised the PO didn't inform you of it's location.
It may be that he was in the process in installing the underbed tank, and wasn't finished yet.

ole dollor · 12-22-2013, 10:25 PM

that would be good if you could find the filler , and use it....

smogrods · 12-22-2013, 10:49 PM

the p/o didnt know a damn thing about this truck. i bought it and he said he never had it running i pulled a valve cover and the heads looked brand new so i ran a # came back as a world motown cast iron head... so i thought id pull a head to see if the 350 was bored and its a brand new never fired 400 stock bore so i drained the pan and there is no oil in the motor even.

Terry Crist · 12-23-2013, 12:49 AM

By looking at your pictures I can see what looks like a filler hose running to the drivers side. Just follow it and see where it goes.

Can you see any wiring coming from the top of the underbed tank. If so, there should be an electrical switch to switch the fuel gauge from one tank to the other. The switch could also be hooked up to the tank transfer switch that you show in the cab.

If there is no switch for the fuel gauge there might be an electric fuel pump to transfer the fuel from the underbed tank to the tank behind the seat.

Also the underbed tank could be the only one hooked up and whoever added the tank never removed the in cab tank.

Looks like follow the yellow brick road time.

swamp rat · 12-25-2013, 12:24 AM

Could be a marker light fill.. Try and find an inlet hose/tube and see where its terminated. Could also be a non finished project.

Andy4639 · 12-25-2013, 11:01 AM

From the picture it looks like it is in the fender well on the backside of the truck.

Tinkermc · 12-25-2013, 01:48 PM

Did you find it yet?

12-22-2013, 09:12 PM	#1
smogrods Registered User Join Date: Oct 2013 Location: Simi Valley Posts: 4	New guy here... quick question for the pros hey every one ive been lurking for a few weeks now and i came across something weird on my c-10. I bought this 1970 c-10 lwb in oct and have been tinkering on it getting it to a reliable driving state since. ive been rewiring the entire truck. well when i was under it today i noticed it has 2 fuel tanks one in the cab and one under the bed.. as well as a selector switch that i only assume is a tank selector on the floor. where is the fuel filler for the under bed tank? please see my pics. here is the tank selector switch (i think) the cab tank some shots of the under bed tank some shots of the side of my truck.

12-22-2013, 09:24 PM	#2
Tinkermc Registered User Join Date: Jul 2011 Location: Farmville, Va Posts: 3,026	Re: New guy here... quick question for the pros bet it fills from the tank in the cab, but if you work like a snake you can follow the filler neck if there is one.

12-22-2013, 09:44 PM	#3
Hawghauler Registered User Join Date: Nov 2012 Location: Whidbey Island/Edmonds,WA Posts: 360	Re: New guy here... quick question for the pros Sometimes with the underbed tanks, they put the filler in the bed. Sometimes in the driver's side tail light, sometimes in the driver's side rear clearance light, sometimes behind the rear license plate, and sometimes inside the rear wheel well. I'm surprised the PO didn't inform you of it's location. It may be that he was in the process in installing the underbed tank, and wasn't finished yet. __________________ If I have to be on 4 wheels, It has to be a classic Chevy 1967 c10 Longbed (Hawghauler/Icy weather transport) 2003 BMW K1200GT (Rain bike) 2007 Softail Deuce (Sun bike) 2009 Ultra Classic Electra Glide (Everything else bike)

12-22-2013, 10:25 PM	#4
ole dollor Registered User Join Date: May 2012 Location: Anton, Texas Posts: 2,364	Re: New guy here... quick question for the pros that would be good if you could find the filler , and use it....

12-22-2013, 10:49 PM	#5
smogrods Registered User Join Date: Oct 2013 Location: Simi Valley Posts: 4	Re: New guy here... quick question for the pros the p/o didnt know a damn thing about this truck. i bought it and he said he never had it running i pulled a valve cover and the heads looked brand new so i ran a # came back as a world motown cast iron head... so i thought id pull a head to see if the 350 was bored and its a brand new never fired 400 stock bore so i drained the pan and there is no oil in the motor even.

12-23-2013, 12:49 AM	#6
Terry Crist Registered User Join Date: Aug 2013 Location: Manteca, California Posts: 59	Re: New guy here... quick question for the pros By looking at your pictures I can see what looks like a filler hose running to the drivers side. Just follow it and see where it goes. Can you see any wiring coming from the top of the underbed tank. If so, there should be an electrical switch to switch the fuel gauge from one tank to the other. The switch could also be hooked up to the tank transfer switch that you show in the cab. If there is no switch for the fuel gauge there might be an electric fuel pump to transfer the fuel from the underbed tank to the tank behind the seat. Also the underbed tank could be the only one hooked up and whoever added the tank never removed the in cab tank. Looks like follow the yellow brick road time.

12-25-2013, 12:24 AM	#7
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: New guy here... quick question for the pros Could be a marker light fill.. Try and find an inlet hose/tube and see where its terminated. Could also be a non finished project. __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

12-25-2013, 11:01 AM	#8
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,936	Re: New guy here... quick question for the pros From the picture it looks like it is in the fender well on the backside of the truck. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

12-25-2013, 01:48 PM	#9
Tinkermc Registered User Join Date: Jul 2011 Location: Farmville, Va Posts: 3,026	Re: New guy here... quick question for the pros Did you find it yet?



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