'78 Dual Tank Valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smoothrefuser · 03-23-2005, 12:46 AM

Just bought truck and the fella I bought itfrom had new valve put in it, but said it leaked from the start, but wasn't too worried about it. It just leaks for a few minutes after you turn it off. I've looked closely at it and it seems to be a defect in the valve. Is there a way to bypass the valve altogether and just run one tank, there's five lines running into the valve.

79BIG10 · 03-24-2005, 03:09 AM

Yes the correct way is to take the passenger side tank and hook up the return line (smaller lines) and the fuel lines and connect them (fuel to fuel, return to return) to each one on either side of the valve. When the switch is on the driver side then the valve is powered on. When power is off it autmatically defaults to the passenger side. Just make sure to check for leaks after you've attached everything. Also make sure to plug off the vent and fuel line from the driver side. The way I did this was to take a bolt on both sides and inserting them into the lines and hose clamp in place.

boxrodz · 03-24-2005, 04:06 AM

As I mentioned in a previous post, I replaced my 6-port fuel valve. It also had a 'very' slight leak on one of the riveted seams on the valve (when running on one of the tanks). At high throttle, I had fuel delivery problems similar to a bad fuel pump. I suspect that air was entering the fuel line at the seam. Fuel pump was $65 to replace with a AC/Delco.

03-23-2005, 12:46 AM	#1
smoothrefuser Registered User Join Date: Mar 2005 Posts: 2	'78 Dual Tank Valve Just bought truck and the fella I bought itfrom had new valve put in it, but said it leaked from the start, but wasn't too worried about it. It just leaks for a few minutes after you turn it off. I've looked closely at it and it seems to be a defect in the valve. Is there a way to bypass the valve altogether and just run one tank, there's five lines running into the valve.

03-24-2005, 03:09 AM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Yes the correct way is to take the passenger side tank and hook up the return line (smaller lines) and the fuel lines and connect them (fuel to fuel, return to return) to each one on either side of the valve. When the switch is on the driver side then the valve is powered on. When power is off it autmatically defaults to the passenger side. Just make sure to check for leaks after you've attached everything. Also make sure to plug off the vent and fuel line from the driver side. The way I did this was to take a bolt on both sides and inserting them into the lines and hose clamp in place. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

03-24-2005, 04:06 AM	#3
boxrodz Until Seventy Times Seven Join Date: Feb 2005 Location: Rocky Mountain Front Range Posts: 1,301	As I mentioned in a previous post, I replaced my 6-port fuel valve. It also had a 'very' slight leak on one of the riveted seams on the valve (when running on one of the tanks). At high throttle, I had fuel delivery problems similar to a bad fuel pump. I suspect that air was entering the fuel line at the seam. Fuel pump was $65 to replace with a AC/Delco. __________________ boxRODz 1983 C10 SWB Fleetside When two halves is gone, there's nuthin left. Two nothings is nuthin. That's mathematics son. You can argue with me but you can't argue with figures. Two half nothings is a whole nuthin...



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