Replacing the Fuel Pump
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 1,091
Likes: 45
From: Albuquerque New Mexico
Here's the update, sorry took so long....I was in Cali (Corvette Capital) the past 3 days.
Hooked up the gauge to see no pressure, just as I'd thought. Pulled out the fuel pump and started from square one. What i did different was I added some fuel line between the pump and the pulsator, those two just weren't connecting so i figured that had to be where it wasn't getting thru. Put it all back together and sure enough it fired up and runs great.
Best part is, NO MORE FLUTTER in the idle. Let it run for 20 minutes and took it for a 10 minute drive and it idles perfect at the stop lights now. YIPPEE!
Thanks for all the help and support, you guys rock. If you're ever in town the beers are on me!
Hooked up the gauge to see no pressure, just as I'd thought. Pulled out the fuel pump and started from square one. What i did different was I added some fuel line between the pump and the pulsator, those two just weren't connecting so i figured that had to be where it wasn't getting thru. Put it all back together and sure enough it fired up and runs great.
Best part is, NO MORE FLUTTER in the idle. Let it run for 20 minutes and took it for a 10 minute drive and it idles perfect at the stop lights now. YIPPEE!
Thanks for all the help and support, you guys rock. If you're ever in town the beers are on me!
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 1,091
Likes: 45
From: Albuquerque New Mexico
I used fuel line hosing, should i switch to Fuel Injection? It was 50psi bought at checkers on the same rack they keep the fuel injection lines! Did notice that the line i put in was 5/16 though, compared with 3/8 that is coming off the gas tank. Will that make a difference? Your thoughts please, i do appreciate it!
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Ruh Roh....
OK...back to square one. Does it have fuel pressure during the no-start condition, and if so, how many pounds?
The fuel filter is located on the passenger side frame rail, close to the firewall. If in doubt, change it.
OK...back to square one. Does it have fuel pressure during the no-start condition, and if so, how many pounds?
The fuel filter is located on the passenger side frame rail, close to the firewall. If in doubt, change it.
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Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 1,091
Likes: 45
From: Albuquerque New Mexico
it doesn't stay started long enough for me to get a pressure reading....lasts about 2 seconds if i dont press the gas, if i do it's less. I'll try the filter, hopefully that's it and it is cheap enough to replace.
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
It doesn't have to start to get a fuel pressure reading. It works like this;
When you turn the key on, the fuel pump is energized for approx 2 seconds to pressurize the fuel rail. The pump then shuts off unless the car is being cranked or the engine is running, but the fuel rail should remain pressurized for several minutes....even with only the 2 second pressurization cycle. The shut off is a built in safety feature, where in the case of a serious accident when the engine stops, so does the flow of fuel.
If it's losing pressure immediately after the pump quits running, we need to find out why.
You can run a wire from the positive terminal on the battery to terminal G on the ALDL (diagnostic link under dash). This will cause the pump to run continually even with the key off. GM built this in as a diagnostic feature.
But reading between the lines, I'm hearing no fuel pressure, right? Let's change the filter to rule it out....and then we go hunting again.
When you turn the key on, the fuel pump is energized for approx 2 seconds to pressurize the fuel rail. The pump then shuts off unless the car is being cranked or the engine is running, but the fuel rail should remain pressurized for several minutes....even with only the 2 second pressurization cycle. The shut off is a built in safety feature, where in the case of a serious accident when the engine stops, so does the flow of fuel.
If it's losing pressure immediately after the pump quits running, we need to find out why.
You can run a wire from the positive terminal on the battery to terminal G on the ALDL (diagnostic link under dash). This will cause the pump to run continually even with the key off. GM built this in as a diagnostic feature.
But reading between the lines, I'm hearing no fuel pressure, right? Let's change the filter to rule it out....and then we go hunting again.
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Thanks. A lot of folks on this board have done the same for me over the years, and have saved me a lot of time, money, and aggravation. Passing it on is the least I can do. If we were in the same town I'd go over and get my hands dirty.
Slingshot
Joined: Dec 2001
Posts: 3,817
Likes: 24
From: Charlotte NC
I replace the fuel pump on my 86 three years ago. If you used the wiring diagram that came with the Autozone pump, it is wired backwards. I wired mine according to the instructions. The car wouldn't run. I had to reverse the wires from the instructions.
Give it a try.
Give it a try.
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
[QUOTE=Frizlefrak;1567857485]Thanks. A lot of folks on this board have done the same for me over the years, and have saved me a lot of time, money, and aggravation. Passing it on is the least I can do. If we were in the same town I'd go over and get my hands dirty.[/QUOT
How Bout this , Im reading this post daily to see the results,
Im currently going thru major headaches with my 96 running
like total ****. !!!!!
So far looks as if you've got 505 in a good direction with his..
Guys like you have made my life so much easier to maintain my car.
Hats off to you Frizlefrak...
How Bout this , Im reading this post daily to see the results,
Im currently going thru major headaches with my 96 running
like total ****. !!!!!
So far looks as if you've got 505 in a good direction with his..
Guys like you have made my life so much easier to maintain my car.
Hats off to you Frizlefrak...
Last edited by ol school; Nov 15, 2008 at 07:25 PM. Reason: adding a sentence
Thread Starter
Burning Brakes
Joined: Oct 2008
Posts: 1,091
Likes: 45
From: Albuquerque New Mexico
Ok, update. New Fuel Pump.....New Fuel Filter. Idles great.....however, i can give it gas in park and neutral and it revs up fine, however, soon as i throw it in drive and give it gas it almost dies on me! What is up with that? Any ideas?