mystingray1

I put an 82 sending unit in my 81 for fuel injection purposes (in tank pump) and now my gas gauge is pegged and then some??? any ideas on this one? i connected the old sending unit wire up to the new sending unit i am sure there is no short, do i need to add an inline resistor, are the ohm's of resistance different between 81 and 82 sending units??

MelWff

see if this Wilcox article helps, is your 82 sending unit new or used?
http://repairs.willcoxcorvette.com/w...it-testing.pdf

mystingray1

Thanks, it appears that i have no ohms resistance at the tank, with no ohm resitance coming from the tank the default position is for the gauge to go to three o'clock, looks like i will need to pull the sending unit

mystingray1

sending unit is new, hopefully it is just a bad connection on the sending unit

DUB

I have seen the float assemblies on these new sending units fall off and lay inside the tank.

Obviously I would use jumper wires to get it to work before I go back in with it.

DUB

mystingray1

Thanks, the floater is still on i am sure as i have had the sending unit in and out many times during the FI process, maybe i just have a loose wire in the tank

Kacyc3

I just replaced the 82 sender i had in my 79, i noticed when i took the old one out it knocked the plug loose from the inside. (dont buy ebay specials) Possible test is does the fuel pump run?

0Willcox Corvette

Pull the ohms wire off the sender and take a reading at the sender before you pull it. It could be a wiring issue at the sender, a defective sender, bad ground at the sender.....

If the gauge is reading just a tad past the 3 oclock rivet, you don't have any ohms input.

Willcox

mystingray1

the fuel pump runs, not sure what the plug is that you are referring to?

DUB

The electrical plug that attaches to the underside of the sending unit.

DUB

mystingray1

oh right, that could be where my electrical problem is, guess i will know when i pull the sending unit back out

shenango

I had the same 3 oclock issue in my 75. I was advised to check and clean the ground wire between the tank and frame. Your sending unit is grounded to the tank and the tank and gauge are grounded to the frame. If all grounds are not clean and secure the gauge will point to the extreme right. By the way, I got this info from an old thread on this forum. My 75 is now working properly after some judicious cleaning.
Jerry

mystingray1

Thanks but i am going to assume my ground to the frame is good being as the fuel pump works

DUB

DUB