Our 2003 Chevy Tahoe Flex Fuel system doesn't maintain pressure on the fuel line over time and has trouble starting. It rarely starts on first turn of key. We replaced the fuel pump, the fuel filter, the fuel regulator, the throttle body, the crank shaft positioning sensor and still had problems starting the truck. So we decided to check the fuel pressure. We found that after turning the key several times that our fuel pressure was normal and the truck would start but after sitting for an hour or more the pressure would leak down. When we put a gauge on it by the fuel filter the pressure stays consistent over time but when we put the gauge on the fuel rail it goes to zero over time. Is it supposed to do that? If not, what could be causing it? Remember we have already replaced the fuel pump and fuel regulator. The only thing we haven't replaced or checked is the fuel injectors.
have the same problem?
Saturday, October 16th, 2010 AT 10:04 AM