icanfixall
Official GMM hand model
Ever since I modified my tanks with the 1/2 inch air line off the tops the tanks are under vacuum. The motor runs but sometimes it will advance the pump and it sure rattles the motor. This usually happens after a cold start and I drive off anywhere up to about 1 miles. If the motor starts and I let it warm up in the driveway it will run up a few times and drop back to idle. Almost sounds like its running out of fuel... Probably is... Is there something wrong with my fuel caps not venting to the outside... I no longer have the rollover valves. That was removed when I installed the large vent lines to the fill necks....