Too Much Fuel? Help!
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4th Gear
Joined: Jan 2012
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Too Much Fuel? Help!
Recently changed fuel pump in 1993 Corvette. When I tried to start after replacement, the engine made a very loud ticking noise. I pulled all spark plugs and gasoline ran out of 2 cylinders. So I dry fired it and made sure all of the gas was out. What are the possibliites that the engine is okay at this point? I did try and start but it turned over and did not start. Not sure if I should keep trying.
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Joined: Apr 2011
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Well, you obviously killed the pressure regulator somehow.
You cannot have "too much fuel".
People fight and struggle to get more fuel flow. You can send huge amounts of fuel to the engine...its the fuel regulators job to reduce that to a usable level. When the regulator diaphram blows then it blows all the fuel out thru the vac fitting into the intake.
The other thing that CAN happen but it takes more stuff to be screwed up is the fuel inj circuit is shorted out and the injectors are stuck ON and whenever the key is ON the pump is pumping fuel directly into the intake with injectors that are stuck OPEN.
If it made some noises...when you cranked it and it attempted to fire...lets all PRAY that you did not "hydro"
the motor.
Being a fan of basic physics, this is a lesson that should be taught to everyone that works on engines...
" you cannot compress a liquid"
When you try, because the liquid cannot compress, something else will yeild to the forces that are on the parts...usually a broken piston, piston rings, ring glans, or bent rods. Not good stuff.
Before getting too out of shape...find out where the fuel came from. Probably the vac port on the regulator. If so, replace the reg.
IF it was stuck inj, figure that out.
Change the oil a couple times when its all done, as its contaminated with gas now.
If all this gets fixed and the engine will start, see if it has a misfire or sputter. if it DOES...stop and compression test every cylinder until you find the bad one. Depending on what the compression is, and what you do to complete the test,. you'll know if there is serious mechnical damage.
Hydro'ing a motor is bad news. With these aluminum pistons, they are easy to break and a cylinder full of gasoline is the fastest way I can think of.
Hopefully that did not happen but you need to go back and find the cause of all this and repair it. Fuel systems are not like the old carb days where if it was close it was close 'nuff. EFI is precise, exact and sterile clean. When its not right its BIG wrong and can do untold damage.
One of the first things would be to check the oil level...and drain it and replace with some cheap oil for now. See whats in the oil. If there are chunks...game over.
You also need the proper test tools to work on these engines. fuel pressure test gauge, noid lite, and MOST important of anything, a FSM. Its hopeless without that,.
You cannot have "too much fuel".
People fight and struggle to get more fuel flow. You can send huge amounts of fuel to the engine...its the fuel regulators job to reduce that to a usable level. When the regulator diaphram blows then it blows all the fuel out thru the vac fitting into the intake.
The other thing that CAN happen but it takes more stuff to be screwed up is the fuel inj circuit is shorted out and the injectors are stuck ON and whenever the key is ON the pump is pumping fuel directly into the intake with injectors that are stuck OPEN.
If it made some noises...when you cranked it and it attempted to fire...lets all PRAY that you did not "hydro"
the motor.
Being a fan of basic physics, this is a lesson that should be taught to everyone that works on engines...
" you cannot compress a liquid"
When you try, because the liquid cannot compress, something else will yeild to the forces that are on the parts...usually a broken piston, piston rings, ring glans, or bent rods. Not good stuff.
Before getting too out of shape...find out where the fuel came from. Probably the vac port on the regulator. If so, replace the reg.
IF it was stuck inj, figure that out.
Change the oil a couple times when its all done, as its contaminated with gas now.
If all this gets fixed and the engine will start, see if it has a misfire or sputter. if it DOES...stop and compression test every cylinder until you find the bad one. Depending on what the compression is, and what you do to complete the test,. you'll know if there is serious mechnical damage.
Hydro'ing a motor is bad news. With these aluminum pistons, they are easy to break and a cylinder full of gasoline is the fastest way I can think of.
Hopefully that did not happen but you need to go back and find the cause of all this and repair it. Fuel systems are not like the old carb days where if it was close it was close 'nuff. EFI is precise, exact and sterile clean. When its not right its BIG wrong and can do untold damage.
One of the first things would be to check the oil level...and drain it and replace with some cheap oil for now. See whats in the oil. If there are chunks...game over.
You also need the proper test tools to work on these engines. fuel pressure test gauge, noid lite, and MOST important of anything, a FSM. Its hopeless without that,.
Last edited by leesvet; Jan 26, 2012 at 08:56 PM.
