Faulty fuel tank sending unit
Thread Starter
Member
Posts like a V-Tak
Joined: Aug 2014
Posts: 32
Likes: 1
From: Macon, GA
I replace JUST the sending unit in July 2017. I checked my past orders on Rock Auto and the replacement was manufactured by Dorman. The fuel pump was working ok then, (and still is) so I didn't replace it.
Senior Member
True Car Nut
Joined: Feb 2014
Posts: 2,878
Likes: 1,097
From: Worcester, Ma.
Well, it'* a straight shot from the sender to the gage.....at 150 ohms, that gage should be rock solid just over 1/2.....by reading 150 ohms at B7/B17, that means there is nothing wrong with the wiring to the gage........since the gage reads incorrectly, if the harness connectors are tight, then it has to be the gage.....
Thread Starter
Member
Posts like a V-Tak
Joined: Aug 2014
Posts: 32
Likes: 1
From: Macon, GA
Tech II,
Can you decipher the hieroglyphics on the sticker in the photo? I mis-typed the date, looks like December 2007 and lists the mileage. The other stuff doesn’t mean anything to me though.
Can you decipher the hieroglyphics on the sticker in the photo? I mis-typed the date, looks like December 2007 and lists the mileage. The other stuff doesn’t mean anything to me though.
Retired
Certified Car Nut
Joined: Jul 2003
Posts: 17,960
Likes: 1,839
From: Dark Side, AZ
Well, it'* a straight shot from the sender to the gage.....at 150 ohms, that gage should be rock solid just over 1/2.....by reading 150 ohms at B7/B17, that means there is nothing wrong with the wiring to the gage........since the gage reads incorrectly, if the harness connectors are tight, then it has to be the gage.....
Thread Starter
Member
Posts like a V-Tak
Joined: Aug 2014
Posts: 32
Likes: 1
From: Macon, GA
Took instrument cluster to Hamp'* in Atlanta and according to their test equipment everything is functioning correctly. Their suggestion was to use an OEM sending unit.
I'm still puzzled though by the readings I got when using resistors to test the fuel gauge. It would seem that there is something else in the circuit that is causing higher resistance some of the time.
I'm still puzzled though by the readings I got when using resistors to test the fuel gauge. It would seem that there is something else in the circuit that is causing higher resistance some of the time.
Senior Member
True Car Nut
Joined: Dec 2018
Posts: 3,246
Likes: 1,606
From: Flint, MI USA
Took instrument cluster to Hamp'* in Atlanta and according to their test equipment everything is functioning correctly. Their suggestion was to use an OEM sending unit.
I'm still puzzled though by the readings I got when using resistors to test the fuel gauge. It would seem that there is something else in the circuit that is causing higher resistance some of the time.
I'm still puzzled though by the readings I got when using resistors to test the fuel gauge. It would seem that there is something else in the circuit that is causing higher resistance some of the time.
Thread Starter
Member
Posts like a V-Tak
Joined: Aug 2014
Posts: 32
Likes: 1
From: Macon, GA
I figured I would re-assemble things and drive the Park Avenue while waiting for the new AC-Delco sending unit to come in. Before installing the four conductor plug at the fuel pump, I blasted the female and male sides with some CRC Electronic Cleaner. Lo and behold, the fuel gauge now seems to be working as it should. When I started driving it again on Thursday the gauge read a hair over 3/4 and over the course of four days and 80 miles it'* down to about 1/2 tank
