ahspros

Fuel gage will not show full only 3/4 when tank is full of fuel. I jumper the terminals on the sender that should have sent the needle to the full line. It went just to the 3/4 mark. Sending unit is working correctly.
Could not locate a replacement. Any way of adjusting the gage?
Walt

Speedtoys

Ya, ignore it. The red warning light however, is still highly likely to be accurate as its a set of contacts in the float itself.

Or remove cluster, clean everything, hope you don't make something else worse.

The Forgotten On

It is partially the cluster, but also the sender getting dirty inside on its wires. Cleaning the sending unit itself does wonders.

beran earms

Someone just recently did a very nice write up and repair on this, I'm trying to find it. Maybe only 2 months ago?

240Z TwinTurbo

It was me, the "rookie."
https://rennlist.com/forums/928-foru...-fixed-it.html

I would check the impedance across the two terminals you jumped (but on the sending unit and not connector) when the tank is full to make sure you are seeing below 3 ohm.

Michael Benno

jbarrow

My gauge reads low and I was curious if the low fuel warning light functioned as intended. I knew the bulb was good as it goes on when the ignition key is turned to position 1, but will it illuminate when the reserve level of fuel had been reached in the tank? I drove it to work for three days with the needle below the red line covering about 70 miles, waiting for the light to go on. It did not and today I sputtered to a stop in the parking lot in front of my office. Lucky spot for that to happen.

There are good suggestions in this thread. Concerning the non-illuminating idiot light, does repair or replacement involve dropping the fuel tank?

ROG100

We have replacement fuel level sensors in stock for $149.95

jbarrow

Roger, is this the part number from your site?

928 641 030 01A

belgiumbarry

i have the same "problem" in the rally car build with VDO gauges …. with sure still 30 l fuel the warning light comes on... i expected the level reading would not be exact ( VDO gauge /oem sender ) but not the warning light... that's just a contact i suppose… perhaps it will get more accurate with use & driving after 12 years of storage ??

ROG100

Yes and the price has been updated.

Fox_

Mine has a droopy fuel gauge as well.

It's a 1/4 tank low through the entire range.

Ladybug83

Mine too! Reads about 1/4 tank low when in operation. But when I jumper the contacts, it reads full like it should.

Had the gauge inspected, and they said good. Gauge circuit foil is new
Fuel sender is new
Inspected the tank vent hose and there are no kinks

Same results. I'm at a loss. Someone mentioned cleaning the grounds, I can do that again but otherwise, I'm out of ideas

Hey_Allen

Check the resistance at the connections between the cluster and the fuel level sender.
any resistance on that wiring will skew the reading down.

Fox_

Bumping this.

I decided to look into this problem again.

Volt gauge & fuel gauge reading low. Related?

Shorted the fuel sender plug and the fuel gauge only went up to 3/4. I measured the resistance at the plug, nothing.

Any ideas? I went through all the grounds that were reasonably accessible, did nothing. The ground on the steering column is not the issue.