Pressure Regulator
Should fuel shoot out the top of a fuel pressure regulator?
I have been having trouble starting my 1994 chevy cavalier, so while i was trying to figure out the problem i disconnected the vacuum hose from the top of the fuel pressure regulator. When i turned the key on, gas shot out the top of the regulator like a fountain. Does this mean the regulator is faulty or is that how it is supposed to be?
the regulator is faulty if there is fuel coming through the vacuum line. fuel should NEVER make it to the vacuum side of the regulator for any reason. the vacuum line is supposed to suck air to move a rubber diaphragm inside the regulator, allowing a valve to open and send excess fuel back to the fuel tank. if there is fuel going through the vacuum line that would explain why you are having trouble starting the car. the vacuum comes from suction inside the intake manifold, so all of that fuel is being sucked back into your intake causing the car to run extremely rich.
I’m assuming that when your car finally does start you have a noticeable amount of black smoke that spews from the exhaust. you need to replace your regulator asap. the longer you wait to replace it the more fuel you are throwing down the drain, and the sooner your car will require major repairs. eventually you will wind up with fuel running past your pistons and getting into the oil, which destroys bearings. you will also wind up with fuel fouled plugs, requiring early replacement. also, the unburnt fuel can wreak havoc on your o2 sensors, clogging them with soot and requiring early replacement.
Fuel pressure regulator- GM cars and trucks
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