| [GMCnet] Fuel Problem [message #349356] |
Wed, 16 October 2019 18:49  |
amansfield1104
Messages: 80
Registered: August 2009
Karma:
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On my ay back from Mansfield Ohio I had a problem I can not explain. I had installed an electric fuel pump to operate when I switch to the back up tank. It worked for a while when needed and I used it to get fuel pressure before I started the engine. I lost the mechanical fuel pump on the way back. I switched to the electric fuel pump and no pressure. I assume the valve to switch tanks quit.
I turned one the electric fuel pump and gas came out of the carbon canister. I dead headed the line going to the canister as it leagued gas. So why would gas from the fuel pump that was dead headed if the valve to switch tanks did not work. How did it pump gas out of the carbon canister?
I will switch to two electric fuel pumps with check valves if front of the electric fuel pumps. The fuel pumps will not be in the tanks. The fuel pumps will be mounted just before where the valve to switch the tanks is located.
I’ll remove the mechanical pump.
I’d like to know why the canister dumped gas? Could I have something wrong? Could a dead headed electric pump pressurize the tanks? I did not think that could happen.
To get gas to prime the engine the electric pumps was used to get gas into a bottle so I know the pump worked.
I checked the electric pump after getting homeland it is not producing any fuel pressure.
This makes the third mechanical pump I’ve replaced in about 30,000 miles. The pump installed were what I could find close to where it quit. Not the best pumps.
Thanks
Art
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