fuel tank sending unit voltage

[MustangSally44]

Queck question. is the voltage at the sending unit reduced? Im getting 4.5v at the sending unit.. Figured it should be 12 but then I remembered my bike guage is reduced to 7v Thanks guys.

 

[Don C]

Yes, it is reduced by the instrument voltage regulator, which is attached to the back of the main gauge cluster.

 

[mrgmhale]

I will double check once back at my laptop. But I think you ought to be getting 5.5 volts DC pulsating to the fuel sender. By Sunday afternoon I ought to have the info

 

[MustangSally44]

Was using my digital multi meter and it was all over the place, so iI might have 5.5v but the meter cant react fast enough to changes in voltage. Thanks Mrgmhale for looking that up. Have a new gremlin now so the fuel float will have to wait till I get the car running.

 

[midlife]

Was using my digital multi meter and it was all over the place, so iI might have 5.5v but the meter cant react fast enough to changes in voltage. Thanks Mrgmhale for looking that up. Have a new gremlin now so the fuel float will have to wait till I get the car running.

Actually, the digital meters react too fast! You need the old analog Simpson meters to adequately measure the variable voltage that averages to 5.5.V.

 

[mrgmhale]

I will double check once back at my laptop. But I think you ought to be getting 5.5 volts DC pulsating to the fuel sender. By Sunday afternoon I ought to have the info

Sorry for the delayed followup. Wedding weekend for our son. Lots of family visiting.

Anyway, yes. 5.5 volts pulsating at the fuel sending unit from the Instrument Voltage Regulator (IVR).