Pontiac: Pontiac Grandam 93 - gaz gauge problem

In article <e2nMb.33243$videotron.net>,
ca says... 

Still have the old unit? Unplug the wire harness going to the gas tank
and plug the old unit in. Move the float up and down on the old unit and
have someone watch the gas gage. If the gage works then you know the
problem is with the new unit you put in. This is why you should check
the replacement unit with an ohm meter before you go putting it in.

A used fuel pump is about the worst idea I've heard in quite awhile.
A gage that reads full can be do to a shorted wire, also.
GW



"Bon·ne·ville" wrote:
 

--
GW - Conservational Ergonomist - note incorrect email address
"It's good to yell at people and tell them you're from Tennessee. That way
you'll be safe." - Gary Busey
www.geoffwelsh.com

Geoff Welsh wrote: 
Yes. Thanks, I couldn't remember if wire shorted was full or empty.

According to my '92 GA shop manual the fuel gauge sender is at 90 ohms when
full and 0 ohms empty. An open wire, not a short, would make the gauge show
full all the time.

However, my own experience is that the "wiper" arm does not make good
contact with the resistance strip on the sending unit. It's my theory that
the used sending unit's sliding contact area could have oxidized if it was
not submerged in gasoline in the scrap yard (or wherever it was).

The sending mechanism is rather delicate. It does not lend itself well to
cleaning/polishing the contact surfaces. I would very much welcome an
aftermarket replacement unit.


"Geoff Welsh" <net> wrote in message
news:net... 
on when 
it be 
working 
way