Fuel gauge sending unit

[HellOnWheels]

Anyone know how to set (ohm's?) on the in-tank fuel gauge sending unit to get a correct reading at the guage??

TIA
HellOnWheels

 

[TurboRussty]

please i would love to know too..

 

[salvageV6]

I think the range is 0 to 90 ohms like most GM's.

 

[6pack]

Originally posted by HellOnWheels
Anyone know how to set (ohm's?) on the in-tank fuel gauge sending unit to get a correct reading at the guage??

TIA
HellOnWheels

Not being a smart a**, but I don't think the ohms can be set. At least I don't think they can. Someone please correct me if I'm wrong. HTH

 

[Swt_86]

I agree with 6 pack - don't think there is a way to "set" the ohms on a tank sending unit. You didn't say whether you have an electronic instrument panel or analog. If the gauge is analog, pull the gauge unit out of the dash and clean the three contacts on the back of the gauge AND the three prongs they plug into. It may not look bad, but probably is. This is a common place for our cars to have problems.

 

[HellOnWheels]

The in-tank sending unit is a rheostat type switch which measures resistance (ohm's), the float arm and float is attached to that switch and, depending on fuel level, is translated to ohm's which is read by the dash gauge. If I understand correctly what I'm seeing of the switch, bending the float arm up or down will translate directly to the gauge (by way of the rheostat/ohms)which shows how much gas is in the tank.

What I'm wanting to find out is the hows and wheres to measure the float position that will correlate the correct readings at the gauge. Clear as mud huh :>)

HellOnWheels

 

[SSYNERGY]

I've cleaned mine and adjusted it before, and it worked fine. You can actually remove the rheostat wire board from the assembly, and clean any residue or foreign matter off ot it. I used an eraser on a #2 pencil, which works really well, this is a trick that I learned in the militay, to clean off the gold plated contacts of PC/104 and VME architecture boards. Like mentioned above, you could also slightly bend the FLOAT arm to provide more accurate readings, but it is best to check your work with the tank down with MIN/MAX fuel. What I'm really interested in is, are there any companies out there making new SENDING UNITS with at least a larger FUEL RETURN LINE? I think that GM should have LOGICALLY used the 5/16" line on the sending unit for the FUEL RETURN, and the 1/4" line for the CHARCOAL CANISTER vent, instead.

 

[Swt_86]

You aren't trying to actually have an accurate fuel gauge reading are you??? That would take half the fun out of driving a TR!!! Seriously, the GM spec for a "full" tank reading is 90 ohms according to the shop manual. Hope this helps.