1937 Ford LS2 Install
Are you using the fuel pressure sensor in the sending unit? If you deleted it, are you sure you didnt remove the low reference wire? According to the diagram Bozzhawg posted, there are only two wires from the fuel level sender, C3 49 low reference, and C1 37 fuel level sensor signal, might check to make sure they're there and hooked up. Hope this helps.
TECH Enthusiast
Joined: Jan 2010
Posts: 578
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From: REALITY
Yelp the problem seems to be between the ecm and sending unit....
I agree with LS1nova, something is not reading or I saw where you cut the length of the rods for the float... Maybe some how it not registering or the float is stuck and not moving... when you cut the springs, this changes the spring rate.....
I agree with LS1nova, something is not reading or I saw where you cut the length of the rods for the float... Maybe some how it not registering or the float is stuck and not moving... when you cut the springs, this changes the spring rate.....
I'm just not sure we can remain friends after this line.
(kidding) I wish I had a machine shop "laying around" while I was building stuff. 
Still looking great, hope you make your deadlines.
Still a top notch / personal favorite in-process build. Yeah, I would pull the sending unit out and manually move the float, Bozzhawg has a good point, it could just be stuck on a baffle or something. In the old days you could ground the sender wire and make the guage go to full, so it may be possible to jump the low reference wire and the fuel level wire and make the guage move, or try just un-hooking the sender and see what that does.
Teching In
Joined: Apr 2010
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ok here is what i found we tried another pump with sender no change... crap next i treaced both wires from tank to ECM both c3 .49 and c1 ..37 both had continity ...would i still need c1 31 from fps to be grounded also even if not using the fps ? we are not using fuel pressure switch
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TECH Enthusiast
Joined: Jan 2010
Posts: 578
Likes: 4
From: REALITY
I think the problem is you are using :
The GTO instrument cluster
The GTO Sending Unit
The GTO ECM/Body Control
But you omitted the GTO fuel pressure sensor.....
I believe that if you are going to continue to use the GTO setup and concept for the fuel system... It prob would be a good idea to use all of the components that makes it function... When you start ommiting things then, the scratching of the head and azz comes in to play and it makes the install a little harder.... Nothing too bad, but it would be easier to keep it close to the oringinal design as possible....
I talked to Ken last week and I told em that I used the Dakota digital dash.... What I did was use the the efi sending unit from the 95 impala tank and wired my fuel gauge connection accordingly.... Plus I don't think you can reset the GTO gauge cluster's odometer too... I know it would be cool to use it but maybe a headache..
Just try to set it up off the reference schematics.... and see if you have a change.... Some how its registering that the tank is empty and not picking up the signal that the float is moving or if its moving at all..... I know the GTO has a high frequency that it reqs vs your standard GM or Ford sending units.....
Goodluck
The GTO instrument cluster
The GTO Sending Unit
The GTO ECM/Body Control
But you omitted the GTO fuel pressure sensor.....
I believe that if you are going to continue to use the GTO setup and concept for the fuel system... It prob would be a good idea to use all of the components that makes it function... When you start ommiting things then, the scratching of the head and azz comes in to play and it makes the install a little harder.... Nothing too bad, but it would be easier to keep it close to the oringinal design as possible....
I talked to Ken last week and I told em that I used the Dakota digital dash.... What I did was use the the efi sending unit from the 95 impala tank and wired my fuel gauge connection accordingly.... Plus I don't think you can reset the GTO gauge cluster's odometer too... I know it would be cool to use it but maybe a headache..
Just try to set it up off the reference schematics.... and see if you have a change.... Some how its registering that the tank is empty and not picking up the signal that the float is moving or if its moving at all..... I know the GTO has a high frequency that it reqs vs your standard GM or Ford sending units.....
Goodluck
Last edited by bozzhawg; Apr 22, 2010 at 02:17 PM.
Thread Starter
TECH Fanatic
Joined: Jul 2008
Posts: 1,570
Likes: 173
Dave (1Badsc) scratching his head trying to resolve the communication issues between the modules.......
"And"......I had an appointment to get the front end aligned today......First time the car moved under its own power in 10 years...Pulling out of the shop..........
Ken
"And"......I had an appointment to get the front end aligned today......First time the car moved under its own power in 10 years...Pulling out of the shop..........
Ken
Thread Starter
TECH Fanatic
Joined: Jul 2008
Posts: 1,570
Likes: 173
GTO Cluster Very nice car, looking at your dash makes me almost want to start my project over and install a GTO dash, The GTO gauge cluster's also came in a blue background which might look good in your car, I have posted a link to another thread I have been following where the guy installed the complete GTO dash and wiring harness and according to his thread everything works except his cruise control, you might be able to pick his brain on getting your GTO cluster working properly. Good Luck
https://ls1tech.com/forums/conversio...9-ta-vert.html
https://ls1tech.com/forums/conversio...9-ta-vert.html
Thread Starter
TECH Fanatic
Joined: Jul 2008
Posts: 1,570
Likes: 173
Very nice car, looking at your dash makes me almost want to start my project over and install a GTO dash, The GTO gauge cluster's also came in a blue background which might look good in your car, I have posted a link to another thread I have been following where the guy installed the complete GTO dash and wiring harness and according to his thread everything works except his cruise control, you might be able to pick his brain on getting your GTO cluster working properly. Good Luck
https://ls1tech.com/forums/conversio...9-ta-vert.html
https://ls1tech.com/forums/conversio...9-ta-vert.html
Ken