|
Trouble with Fuel Gauge
When the ignition switch is turned on, the fuel gauge indicator will sweep from empty to fuel, then return to empty. My initial thought was either improper ground to the gauge or the sending unit but after trying a few things to include running a jumper wire off of the battery straight to the gauge and sending, nothing changed. Any ideas/suggestions?
|
If you know what resistance the sending unit should provide (e.g., 0-30 ohms), disconnect the wires at the sender and test the resistance across the two posts with a multimeter. If it reads about what it should for that amount of gas, then the problem is either the gauge or the wiring between the gauge and the tank. Otherwise, its the sender.
|
Has it ever worked properly?
If not, some gauges need to be calibrated. You might want to check that. If that's the case, you should be able to find instructions for your particular gauge on the manufacturer's website. |
1 Attachment(s)
The car has a few test miles and the fuel gauge has never worked. I think the sending unit is bad because I just checked the resistance and nothing registered on the ohm meter. I also check the gauge with the wires disconnected from the sending unit and it didn't move when the ignition was turned on which makes no sense to me.
Any other ideas before I commit to replacing the sending unit? Edit: Here is a pick of the sending unit. If I have to replace it, can anyone identify the manufacturer? |
That gauge has similar internal electronics to a Stewart-Warner. You can test its function quite easily. Download the ERA troubleshooting guide here:
http://www.erareplicas.com/427man/wiring/wprimer.pdf *fixed link Must be the internet's fault. ;>D |
Bob:
Bad link. You left the L out of erareplicas. Should be http://www.erareplicas.com/427man/wiring/wprimer.pdf Sometimes new employees get the name wrong );-) DonC |
If you replace either the gauge or the sender, replace them both an make sure they are a matched set. I played back and forth with gauge/sender ping-pong until I finally replaced them both as a set and haven't had any problems since.
|
Don, Thanks for taking care of the link.
I talked with Tony and he said it might be covered under warranty but because SAI is under new management, I'll have to wait until Monday for a decision. Considering the car only 6-8 test runs, I hope they honor the warranty. |
Mike,
There's no wire on the terminal marked "send" in your pic, only "Neg" is connected. Is this pic with the sender wire off? |
Gary, by the time I took the pic I had already disconnected both wires. The sender is a three wire unit, left post is positive, center is gnd, and the right post is the send.
|
Mike,
The resistance of the sender should read 240 ohms empty, 33 ohms full. The gauge will read nothing when the sender circuit is open, ie: faulty sender or wire disconnected etc. I use a decade resistance box for gauge operation diagnosis. Quite easy to dial up your resistance values to test gauge operation in almost infinite steps. |
Quote:
|
| All times are GMT -7. The time now is 09:38 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: