saddle tanks question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

franko72 · 12-16-2004, 06:49 PM

the glove box sticker shows aux saddle tanks as an option that is on my truck. My question is do both tanks have sending units installed. I am currently only running on the behind seat in cab tank because when I bought the truck it sat for a long time. Tanks need removed and flushed.There is a selector switch on the dash.I think that it has a short because I have to mess with it to get the correct reading on the cab tank.There is a 3 way switch on the floor near the drivers side.

BobS · 12-16-2004, 06:57 PM

If there is a switch on the dash (left of the instrument panel) there should be a sending unit in at least the left tank. How is the right (passenger side) tank filled? Your driver side tank should fill through the side of the box at the same height as the cab tank. You should be able to crawl under the truck and see if there is a wire running to the right side tank, that would indicate the presence of a sending unit. The factory setup was the left side tank only, the right side was probably added at the dealership or later by a previous owner. Usually a setup like yours will have a sending unit in the left tank and nothing in the right. Your dash switch should only have two positions, one for the in-cab tank and one for the left tank.

Bob

67chevemall · 12-17-2004, 11:57 AM

Wow thats crazy! You can have 3 tanks!
I thought the saddle tanks or cab tank was the options!

GMC Jim · 12-18-2004, 05:28 PM

I have 3 tanks; a sender in each tank and a 3-way switch to read the furl level in each tank...............

BobS · 12-18-2004, 06:55 PM

Some dealer installed or aftermarket setups have senders and a three way switch. Does your switch have a black knob on it like the other dash knobs?

Bob

GMC Jim · 12-18-2004, 07:32 PM

No 'black knob' switch....I installed a 3 position switch under lip of instrument panel; wired to existing fuel quanity gauge and to each tank.

franko72 · 12-20-2004, 11:19 PM

my dash has the black knob with main and aux. sticker above it.So you say that the dealer probably added on the passenger side tank. There seemed to be a few dealer add ons to this truck.The over cab running lights, the front bumper guards,the unity spotlight thru the window, the trans . cooler set up , and last the air horns on top of the cab.I forgot to mention the spear on the hood .

12-16-2004, 06:49 PM	#1
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	saddle tanks question the glove box sticker shows aux saddle tanks as an option that is on my truck. My question is do both tanks have sending units installed. I am currently only running on the behind seat in cab tank because when I bought the truck it sat for a long time. Tanks need removed and flushed.There is a selector switch on the dash.I think that it has a short because I have to mess with it to get the correct reading on the cab tank.There is a 3 way switch on the floor near the drivers side. __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust

12-16-2004, 06:57 PM	#2
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	If there is a switch on the dash (left of the instrument panel) there should be a sending unit in at least the left tank. How is the right (passenger side) tank filled? Your driver side tank should fill through the side of the box at the same height as the cab tank. You should be able to crawl under the truck and see if there is a wire running to the right side tank, that would indicate the presence of a sending unit. The factory setup was the left side tank only, the right side was probably added at the dealership or later by a previous owner. Usually a setup like yours will have a sending unit in the left tank and nothing in the right. Your dash switch should only have two positions, one for the in-cab tank and one for the left tank. Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel Last edited by BobS; 12-16-2004 at 07:27 PM.

12-18-2004, 05:28 PM	#4
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	I have 3 tanks; a sender in each tank and a 3-way switch to read the furl level in each tank............... __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

12-18-2004, 06:55 PM	#5
BobS Senior Member Join Date: May 2001 Location: West Central Minnesota Posts: 568	Some dealer installed or aftermarket setups have senders and a three way switch. Does your switch have a black knob on it like the other dash knobs? Bob __________________ V-6....only GMC Trucks have it! 62 GMC W5000 NAPCO-V6 65 GMC 2500 NAPCO Panel-V6 66 GMC 1000-V6 66 GMC 1500-V6 67 GMC K1500-SBC (originally a KM-V6) 68 GMC C1500-V6 68 GMC C1500-V6 68 GMC Suburban C2500 70 Chevy K20-SBC 71 Chevy C30 Longhorn-SBC 72 GMC Suburban C1500-BBC 72 Chevy C10-SBC 72 GMC C5500-ToroFlow Diesel

12-18-2004, 07:32 PM	#6
GMC Jim Senior Member Join Date: Dec 2002 Location: Portland, Oregon Posts: 901	No 'black knob' switch....I installed a 3 position switch under lip of instrument panel; wired to existing fuel quanity gauge and to each tank. __________________ '71 GMC;fleetside;PB/PS/AC/CC/402 Eng./Custom Paint/110,000act miles/3 fuel tanks(52gal).

12-17-2004, 11:57 AM	#3
67chevemall Registered User Join Date: Apr 2003 Location: NB Posts: 3,367	Wow thats crazy! You can have 3 tanks! I thought the saddle tanks or cab tank was the options!

12-20-2004, 11:19 PM	#7
franko72 Franko72 Join Date: May 2004 Location: Cincinnati,Ohio Posts: 471	my dash has the black knob with main and aux. sticker above it.So you say that the dealer probably added on the passenger side tank. There seemed to be a few dealer add ons to this truck.The over cab running lights, the front bumper guards,the unity spotlight thru the window, the trans . cooler set up , and last the air horns on top of the cab.I forgot to mention the spear on the hood . __________________ 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust



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