Hard(er) start after fuel pump install
Burning Brakes
Joined: Aug 2010
Posts: 833
Likes: 1
Besides "a friend of my friend knows this guy whose brother.....", have you actually seen anyone with that issue? All my car pumps have always run from full to empty and sometimes even empty.
Think about this, IF the pump kept running all day long after it runs out of fuel, you could be right. What do you think happens when you run out of fuel? My car motor stops. When that happens, the pump stops. In fact, it is only on for a few seconds when you turn the key. If it doesn't see the engine run, the FP doesn't get energized. Otherwise, if you crashed your car and didn't turn off the motor, the pump will be fueling the engine still. That could be BAD.
If the pump runs out of gas, engine stops and pump stops. If there is gas, it will pump and cool it. If it gets so hot that it can overheat, what do you think, safety wise, of having such a hot item in an area with pressurized gasoline fumes?
Think about this, IF the pump kept running all day long after it runs out of fuel, you could be right. What do you think happens when you run out of fuel? My car motor stops. When that happens, the pump stops. In fact, it is only on for a few seconds when you turn the key. If it doesn't see the engine run, the FP doesn't get energized. Otherwise, if you crashed your car and didn't turn off the motor, the pump will be fueling the engine still. That could be BAD.
If the pump runs out of gas, engine stops and pump stops. If there is gas, it will pump and cool it. If it gets so hot that it can overheat, what do you think, safety wise, of having such a hot item in an area with pressurized gasoline fumes?
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Whenever we get close to empty, I whistle the tune "Running on Empty" or "Take it to the limit" to **** her off. Marriage is having a dedicated person you **** off.
Thread Starter
Racer
Joined: Apr 2011
Posts: 296
Likes: 1
From: Tipp City Ohio
I don't think the one I used first was the wrong pump as it was an AC Delco that fits my year, just a slightly different build version. To look at the two (EP378 (the 1st and bad one) vs the latest one I installed, the EP375, they look almost identical. I installed it correctly, I had plenty of fuel in the tank so it wasn't gasping for fuel. Also had a brand new Delco fuel sock installed on it. For whatever reason, it just gave up the ghost after just 3 days. New one seems to be running better after giving it a couple days in the car. Fuel pressure seems more steady as well.
I'm having "Tach It Up MotorSports", my local Vette expert, check it out for me to determine if the hard(er) starting is due to a leaking injector emptying the fuel rail volume. He mentioned that if I turn on the key, letting the fuel pump energize and shoot fuel into the system and do this a few times to fill the rail, it would probably start right up without issue, IF, it is emptying due to leak back either into the tank from the check valve or an injector.
I'll let you know when I find out more. As of now, it is running better and the new fuel pump hasn't died yet.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Jon,
I don't think the one I used first was the wrong pump as it was an AC Delco that fits my year, just a slightly different build version. To look at the two (EP378 (the 1st and bad one) vs the latest one I installed, the EP375, they look almost identical. I installed it correctly, I had plenty of fuel in the tank so it wasn't gasping for fuel. Also had a brand new Delco fuel sock installed on it. For whatever reason, it just gave up the ghost after just 3 days. New one seems to be running better after giving it a couple days in the car. Fuel pressure seems more steady as well.
I'm having "Tach It Up MotorSports", my local Vette expert, check it out for me to determine if the hard(er) starting is due to a leaking injector emptying the fuel rail volume. He mentioned that if I turn on the key, letting the fuel pump energize and shoot fuel into the system and do this a few times to fill the rail, it would probably start right up without issue, IF, it is emptying due to leak back either into the tank from the check valve or an injector.
I'll let you know when I find out more. As of now, it is running better and the new fuel pump hasn't died yet.
I don't think the one I used first was the wrong pump as it was an AC Delco that fits my year, just a slightly different build version. To look at the two (EP378 (the 1st and bad one) vs the latest one I installed, the EP375, they look almost identical. I installed it correctly, I had plenty of fuel in the tank so it wasn't gasping for fuel. Also had a brand new Delco fuel sock installed on it. For whatever reason, it just gave up the ghost after just 3 days. New one seems to be running better after giving it a couple days in the car. Fuel pressure seems more steady as well.
I'm having "Tach It Up MotorSports", my local Vette expert, check it out for me to determine if the hard(er) starting is due to a leaking injector emptying the fuel rail volume. He mentioned that if I turn on the key, letting the fuel pump energize and shoot fuel into the system and do this a few times to fill the rail, it would probably start right up without issue, IF, it is emptying due to leak back either into the tank from the check valve or an injector.
I'll let you know when I find out more. As of now, it is running better and the new fuel pump hasn't died yet.
Racer
Joined: Sep 2010
Posts: 305
Likes: 2
From: Epfenbach BW
When I did my fuel pump I installed a new pulsator just while in there. Needless to say, the new pulsator was bad out of the box and my fuel pressure dropped significantly within a few miles resulting in hard start and no power.
Put the old one in and everything is good.
The "pop" you heard may have been the fuel line inside the tank.
If your fuel pump still makes the typical sound 2 seconds after ign on, I´d check the pulsator.
Put the old one in and everything is good.
The "pop" you heard may have been the fuel line inside the tank.
If your fuel pump still makes the typical sound 2 seconds after ign on, I´d check the pulsator.
Thread Starter
Racer
Joined: Apr 2011
Posts: 296
Likes: 1
From: Tipp City Ohio
When I did my fuel pump I installed a new pulsator just while in there. Needless to say, the new pulsator was bad out of the box and my fuel pressure dropped significantly within a few miles resulting in hard start and no power.
Put the old one in and everything is good.
The "pop" you heard may have been the fuel line inside the tank.
If your fuel pump still makes the typical sound 2 seconds after ign on, I´d check the pulsator.
Put the old one in and everything is good.
The "pop" you heard may have been the fuel line inside the tank.
If your fuel pump still makes the typical sound 2 seconds after ign on, I´d check the pulsator.
Thread Starter
Racer
Joined: Apr 2011
Posts: 296
Likes: 1
From: Tipp City Ohio
