LT-1 Fuel Pressure
Burning Brakes
Joined: Jun 2002
Posts: 883
Likes: 0
From: Duluth MN
Re: LT-1 Fuel Pressure (CallawayC12)
It does sound like you are losing fuel pressure. Turning the key a couple of times before starting will build it up to the point where the engine will start.
Inside the fuel pump is a check valve that prevents fuel from draining back into the tank and maintain fuel pressure over night, actually fuel pressure will normally be maintained for several days. The fuel pressure regulator is the cork on the other end of the bottle. Either one of these being bad will cause the fuel pressure to drop and make starting more difficult.
It is pretty easy to determine which is bad. What I do is hook up my fuel pressure gauge, start the engine and let it run for a minute to stabilize the fuel pressure. Then I shut the engine off and make sure the pressure does indeed drop. Then I start and run again, shut it off and crimp the fuel return line near the tank (rubber line). If the pressure still drops, I have a bad fuel pump check valve. If it doesn't, then the fuel pressure regulator is bad.
The final test is to build up fuel pressure and crimp both the intake and return lines. If the pressure drops, then I know I have a leaking fuel injector.
Inside the fuel pump is a check valve that prevents fuel from draining back into the tank and maintain fuel pressure over night, actually fuel pressure will normally be maintained for several days. The fuel pressure regulator is the cork on the other end of the bottle. Either one of these being bad will cause the fuel pressure to drop and make starting more difficult.
It is pretty easy to determine which is bad. What I do is hook up my fuel pressure gauge, start the engine and let it run for a minute to stabilize the fuel pressure. Then I shut the engine off and make sure the pressure does indeed drop. Then I start and run again, shut it off and crimp the fuel return line near the tank (rubber line). If the pressure still drops, I have a bad fuel pump check valve. If it doesn't, then the fuel pressure regulator is bad.
The final test is to build up fuel pressure and crimp both the intake and return lines. If the pressure drops, then I know I have a leaking fuel injector.
