Fuel gauge issue
Thread Starter
2nd Gear
Joined: Jun 2023
Posts: 2
Likes: 0
From: Asheville, NC
Fuel gauge issue
I am hoping someone might have experience and an answer for my situation. I have a 1965 that I installed a crate LS3 motor. I purchased an aftermarket fuel tank from CPP with a 60 psi fuel pump installed. Their sending unit is a single wire sending unit, not the 2-wire standard on the 1965. I did order and receive a 90 ohm sending unit. I did wire the system as they recommended. I used the ohm (tan) wire and attached it to the center post on their sending unit. I then grounded the sending unit to the system ground in the rear wiring harness. This wiring setup does afford the resistance in the sending unit to send a signal back to the gauge. The problem I am having is that the gauge reads full when the float is raised, buy only drops to 3/4 full when the float is in the lowest position (empty). I have replaced both the sending unit and fuel gauge twice, and they are both rated at 0-90 ohm
Any suggestions would be appreciated.
Any suggestions would be appreciated.
Melting Slicks
Joined: Sep 2004
Posts: 2,847
Likes: 439
From: Spring Texas
I don't know anything about floats or gauges, by are you using the factory wiring between the units? Ohm out the wire or try another wire?
Last edited by VinceC5; Jun 8, 2023 at 06:12 PM.
Le Mans Master
Joined: Dec 2004
Posts: 5,492
Likes: 808
From: West coast CA
I am hoping someone might have experience and an answer for my situation. I have a 1965 that I installed a crate LS3 motor. I purchased an aftermarket fuel tank from CPP with a 60 psi fuel pump installed. Their sending unit is a single wire sending unit, not the 2-wire standard on the 1965. I did order and receive a 90 ohm sending unit. I did wire the system as they recommended. I used the ohm (tan) wire and attached it to the center post on their sending unit. I then grounded the sending unit to the system ground in the rear wiring harness. This wiring setup does afford the resistance in the sending unit to send a signal back to the gauge. The problem I am having is that the gauge reads full when the float is raised, buy only drops to 3/4 full when the float is in the lowest position (empty). I have replaced both the sending unit and fuel gauge twice, and they are both rated at 0-90 ohm
Any suggestions would be appreciated.
Any suggestions would be appreciated.
