| GMC Mechanical pump [message #130809] |
Sun, 19 June 2011 00:57  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma:
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Senior Member |
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I have often thought about why not use the other AC pump available for our coach that has the fuel return on it. All that would be required on this would be to add a low pressure return line from the pump to the tanks or fuel filler line. You could tee it into the Onan tap on the rear tank so you know where all returned fuel goes. I have not checked, but that tap may also be available on the front tank with nothing attached to it.
What got me thinking about this is a friend called with a problem on his Ranger. Every time he started the truck it dumped lots of gas all over the ground. I ended up going out with my trailer and towing him back to my hanger. We ended up pulling the bed and found that the return line had come loose at the tank. He had just filled up and had driven it less than 10 minutes when someone flagged him down and told him about the leaking gas problem. When we started it to drive it on the trailer it was dumping gas at an unbelievable rate. We had gasoline everywhere. I never realized before how much gas is returned to the tank. With this much flow I can not see how the gas would have a place to vapor lock in.
After we fixed the leak and reassembled the truck we went back and filled it again. It took 10 gallons. That means he lost 10 gallons through that leak in less than 10 minutes. Some of the returned gas went back into the tank as the hose did not come off. It was just loose.
I think this would be a good solution for people out west experiencing vapor lock problems. It would not take much to implement and sure could not hurt anything.
I've never had vapor lock problems here but I almost always buy 100% real gas, have my wheel liners removed for better cooling, run a 180 degree thermostat, have my steel fuel line between the pump and carb insulated, and have the exhaust crossover blocked. I do on occasion buy 10% alcohol diluted fuel (mostly by mistake) and still have not see any vapor lock problems.
My point in the above paragraph is I have no way to test this alternate fuel pump installation.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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