Fuel pump doesnt pump, but makes noise.
Thread Starter
Melting Slicks
Joined: Sep 2002
Posts: 2,631
Likes: 0
From: Union City CA
Fuel pump doesnt pump, but makes noise.
When I turn the key, no fuel comes out the lines, but when I take out the key I can hear the rear humming, most likely the fuel pump is going on. But when that happens their still isnt any fuel out the lines. So I took off the fuel filter and turned it on, still nothing. :confused: :banghead:
Melting Slicks
Joined: Oct 2000
Posts: 2,019
Likes: 2
From: Na
Re: Fuel pump doesnt pump, but makes noise. (Light84vette)
That's strange. You may want to check out the fuel pump sender assembley and look for any abnormalities. Check the fuel pulsation damper. It may have come loose. This happened to me a while back. It turned out a weld came loose on the sender unit causing the fuel sending line to come out of the pulsation damper :crazy:
Thread Starter
Melting Slicks
Joined: Sep 2002
Posts: 2,631
Likes: 0
From: Union City CA
Re: Fuel pump doesnt pump, but makes noise. (NUckINg FuTS)
Thats BIzarre :crazy: BUt I mean, before the engine swap it did not do this, then all of a sudden it does. :confused:
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: Fuel pump doesnt pump, but makes noise. (Light84vette)
Thats BIzarre :crazy: BUt I mean, before the engine swap it did not do this, then all of a sudden it does. :confused:
How did you wire the FP relay? I think your problem is probably in your wiring. I have an extra pump that is almost new (couldn't use it for the LT1) if you end up needing it.
Wire it this way and it will work
First you remove the ECM
With the ECM removed
Take the White conector (that used to go to the ECM) and wire the fuel pump relay enable signal White ECM plug pin 18/ Drk GRN/Wht wire to an ign source (White ECM plug pin 16 Pnk/Blk wire) then it will work unless you have a problem with the fuel pump or fuel pump relay providing you have not done any thing else.
You do not have to cut the wires (even though thats how I did it).
You can use those blue splice conectors they sell at most auto parts stores.(you know the ones, they crimp on to existing wires and have a second position for a jumper wire)
My car ran fine this way and I know it works.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: Fuel pump doesnt pump, but makes noise. (Light84vette)
BTW what did you do about the return line??????????
You need a regulator between your feed line and your return line so the pump stops trying to build preasure.
If you hooked the line from the fuel pump straight to the carb with out a regulator and return line you may have smoked your pump or blown a fuel line off (check the ground for fuel).
Last but not least, and I'm sure you checked, but it does have fuel, right.
You need a regulator between your feed line and your return line so the pump stops trying to build preasure.
If you hooked the line from the fuel pump straight to the carb with out a regulator and return line you may have smoked your pump or blown a fuel line off (check the ground for fuel).
Last but not least, and I'm sure you checked, but it does have fuel, right.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Fuel pump doesnt pump, but makes noise. (Light84vette)
...but when I take out the key I can hear the rear humming, most likely the fuel pump is going on.
RACE ON!!!
Thread Starter
Melting Slicks
Joined: Sep 2002
Posts: 2,631
Likes: 0
From: Union City CA
Re: Fuel pump doesnt pump, but makes noise. (ejfagala)
Sorry guys, I forgot that I had the car sitting their for 8 weeks now and the gasoline must have evaporated by open lines, but I had them duct tapped shut so I overlooked that one. Put 2 gals in it and I had fuel flowing. And then the fuel stop going on when the key was out but still did not come on when I turned the key.
I checked the regulator and the two red wires to the drivers side of the fuel relay when its mounted is ground. And when I place a Postive charged wire to it, the pump turns on. :crazy:
:confused: Eliminate the ECM? IS it possible to do this and keep the guages working and everything running fine? How exactly did you do this? And how can I access the ECM? I cant get to it, is their a special way to remove the cover plates of the interior? Or do I have to tear apart the whole dashboard down? :confused:
Plus the Passanger side Water sensor drives the fan, so does that go to the ecm and then go to the fan? :confused:
I checked the regulator and the two red wires to the drivers side of the fuel relay when its mounted is ground. And when I place a Postive charged wire to it, the pump turns on. :crazy:
First you remove the ECM
With the ECM removed
Take the White conector (that used to go to the ECM) and wire the fuel pump relay enable signal White ECM plug pin 18/ Drk GRN/Wht wire to an ign source (White ECM plug pin 16 Pnk/Blk wire) then it will work unless you have a problem with the fuel pump or fuel pump relay providing you have not done any thing else.
You do not have to cut the wires (even though thats how I did it).
You can use those blue splice conectors they sell at most auto parts stores.(you know the ones, they crimp on to existing wires and have a second position for a jumper wire)
My car ran fine this way and I know it works.
With the ECM removed
Take the White conector (that used to go to the ECM) and wire the fuel pump relay enable signal White ECM plug pin 18/ Drk GRN/Wht wire to an ign source (White ECM plug pin 16 Pnk/Blk wire) then it will work unless you have a problem with the fuel pump or fuel pump relay providing you have not done any thing else.
You do not have to cut the wires (even though thats how I did it).
You can use those blue splice conectors they sell at most auto parts stores.(you know the ones, they crimp on to existing wires and have a second position for a jumper wire)
My car ran fine this way and I know it works.
Plus the Passanger side Water sensor drives the fan, so does that go to the ecm and then go to the fan? :confused:
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Fuel pump doesnt pump, but makes noise. (Light84vette)
And then the fuel stop going on when the key was out but still did not come on when I turned the key.
And how can I access the ECM? I cant get to it, is their a special way to remove the cover plates of the interior? Or do I have to tear apart the whole dashboard down? :confused:
Plus the Passanger side Water sensor drives the fan, so does that go to the ecm and then go to the fan? :confused:
In switching to a carb (uck) and eliminating the ECM, I am aware of only three concerns. First is the already discussed fuel pump operation. Second is torque converter lock up, and third, you will lose your in dash MPG display.
See? It's all pretty simple when you know how it works. Standing by for more questions. Good luck, and...
RACE ON!!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Racer
Joined: Apr 2003
Posts: 280
Likes: 0
From: edmonton ab
Re: Fuel pump doesnt pump, but makes noise. (CFI-EFI)
...but when I take out the key I can hear the rear humming, most likely the fuel pump is going on.
Something is SERIOUSLY "F" ed up here. When you turn the key to the "on" position, the ECM is supposed to run the pump for 2 seconds to prime the system. Without the engine running, the pump should NOT run, key in and on, or not. As another stated, I too had the pump bracket break and the discharge hose pulled out of the pump, and it ran great, laying in the bottom of the tank and pumping fuel, nowhere. I doubt, under the circumstances, that this is your problem. As a test try jumping terminals "A" and "G" on your ACLC connector, with the ignition switch in the "run" or "on" position. If everything in the tank is OK, you'll get fuel from the fuel line with this test. If not, pull the pump, you may have a problem that coincedentially occured at the same time. If it DOES pump, you have a wiring problem. Good luck, and...
RACE ON!!!
Something is SERIOUSLY "F" ed up here. When you turn the key to the "on" position, the ECM is supposed to run the pump for 2 seconds to prime the system. Without the engine running, the pump should NOT run, key in and on, or not. As another stated, I too had the pump bracket break and the discharge hose pulled out of the pump, and it ran great, laying in the bottom of the tank and pumping fuel, nowhere. I doubt, under the circumstances, that this is your problem. As a test try jumping terminals "A" and "G" on your ACLC connector, with the ignition switch in the "run" or "on" position. If everything in the tank is OK, you'll get fuel from the fuel line with this test. If not, pull the pump, you may have a problem that coincedentially occured at the same time. If it DOES pump, you have a wiring problem. Good luck, and...
RACE ON!!!
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: Fuel pump doesnt pump, but makes noise. (Light84vette)
:confused: Eliminate the ECM? IS it possible to do this and keep the guages working and everything running fine? How exactly did you do this? And how can I access the ECM? I cant get to it, is their a special way to remove the cover plates of the interior? Or do I have to tear apart the whole dashboard down? :confused:
Plus the Passanger side Water sensor drives the fan, so does that go to the ecm and then go to the fan? :confused:
You will loose by removing the ECM is MPG as stated, but you lost that any way when you went to the carb.
You will also loose the ability to lock up the converter, but same as before you lost that with the carb as well.
I did this conversion so I know it works just follow the steps I have given in my other post and all should be fine, and that includes figuring a way to lock up the convereter. I have a temp wiring solution using a togle switch but recomend buying the kit from Bow Tie transmisions for $70.
[Modified by ejfagala, 7:00 PM 9/28/2003]
