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Gas Gauge #750675
July 16th 2019 4:33 pm
July 16th 2019 4:33 pm
Joined: Jul 2019
Posts: 38
Ohio
M
Mikeburkey Offline OP
newbie
Mikeburkey  Offline OP
newbie
M
Joined: Jul 2019
Posts: 38
Ohio
Hello, 94 Chevy g20 5.7 8cyl. My gas Gauge has problem where it stops at around halfway and won't go lower than that but will go up past it, so not stuck but maybe float is bent??? Any suggestions to troubleshoot and test this. And I have no idea how to get the the fuel sending unit, I'm assuming that would be through an access hole in the floor board?


Chevy Van G20 3/4 Ton 5.7 L 8 Cyl
Re: Gas Gauge [Re: Mikeburkey] #750677
July 16th 2019 6:03 pm
July 16th 2019 6:03 pm
Joined: Apr 2019
Posts: 42
Nevada
8
84G20HiTop Offline
newbie
84G20HiTop  Offline
newbie
8
Joined: Apr 2019
Posts: 42
Nevada
Before you make a mountain out of a molehill, inspect all the ground wires of your fuel system/dash gauge wiring.

Put a jack under the tank with a 1x6, take off one (1/2”?) bolt on each strap, lower the jack slowly, watching for still connected wires, disconnect when you can reach, drop tank to ground, unscrew pump, inspect.

I believe, on a 95, that it’s an electric sender and is probably burned up and shorting out or just broken. This has happened in a different car where the tank would read accurate all the way to the “low fuel” signal, then it would give sporadic readings from completely full to empty.

If you look here, https://www.rockauto.com/en/catalog/chevrolet,1995,g20,5.7l+v8,1046797,fuel+&+air,fuel+sending+unit,4436 , there’s a wire that sends the gauge the reading based on resistance.

After you remove the pump from the tank, reach up and plug the connection back in AND ground it to the chassis, move the sender up, as if it were full and inspect the dash gauge, and down, as if it were empty, and verify again with the gauge. Or with a DVOM you should have 0 ohms with sender at empty and 30 ohms at full. Use info acquired to determine a faulty sender.

Re: Gas Gauge [Re: 84G20HiTop] #750686
July 16th 2019 8:21 pm
July 16th 2019 8:21 pm
Joined: Jul 2019
Posts: 38
Ohio
M
Mikeburkey Offline OP
newbie
Mikeburkey  Offline OP
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M
Joined: Jul 2019
Posts: 38
Ohio
Alright thank you very much.


Chevy Van G20 3/4 Ton 5.7 L 8 Cyl
Re: Gas Gauge [Re: 84G20HiTop] #750722
July 18th 2019 11:19 am
July 18th 2019 11:19 am
Joined: Jul 2019
Posts: 38
Ohio
M
Mikeburkey Offline OP
newbie
Mikeburkey  Offline OP
newbie
M
Joined: Jul 2019
Posts: 38
Ohio
Update: So it seems that I have a bad sender of some sort. I took the gauge cluster off to run the gauge through the range and it runs through the range. It also seems that the gauge goes based off voltage and not ohms? The signal wire had 6 volts at half tank and didn't have any resistance. But connecting ground and positive to the signal made the gauge go up and down. And I don't believe that there is a faulty ground or positive causing it stay at only 6 volts. So what I'm assuming is that when I do pull the sending unit out that it will be rusted or stuck at the half way position and lower.


Chevy Van G20 3/4 Ton 5.7 L 8 Cyl
Re: Gas Gauge [Re: Mikeburkey] #750725
July 18th 2019 12:45 pm
July 18th 2019 12:45 pm
Joined: Jul 2019
Posts: 38
Ohio
M
Mikeburkey Offline OP
newbie
Mikeburkey  Offline OP
newbie
M
Joined: Jul 2019
Posts: 38
Ohio
Does anyone know what a good replacement for the fuel sending unit would be. When I look up ones compatable with the 94' model they are $130+ is that normal?


Chevy Van G20 3/4 Ton 5.7 L 8 Cyl
Re: Gas Gauge [Re: Mikeburkey] #750727
July 18th 2019 3:20 pm
July 18th 2019 3:20 pm
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
Just4fun1991 Offline
member
Just4fun1991  Offline
member
Joined: Feb 2018
Posts: 140
Cedar Rapids, Iowa
You may want to visit Rock Auto DOT com

SPECTRA PREMIUM SP17B1H {#19111397, 25028811}

Priced at $68 minus a few pennies and then add Uncle Same and shipping

Re: Gas Gauge [Re: Mikeburkey] #750767
July 20th 2019 7:07 am
July 20th 2019 7:07 am
Joined: Apr 2004
Posts: 1,810
Ireland
shaggy Offline
veteran
shaggy  Offline
veteran
Joined: Apr 2004
Posts: 1,810
Ireland
Did you check all your fuses. Mine stopped at halfway and is working correctly again after replacing a burnt out fuse. Worth a look before you go into a bigger job.


79 chevy G30 cobra camper conversion.
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Re: Gas Gauge [Re: Mikeburkey] #751366
August 07th 2019 2:46 am
August 07th 2019 2:46 am
Joined: Jul 2019
Posts: 38
Ohio
M
Mikeburkey Offline OP
newbie
Mikeburkey  Offline OP
newbie
M
Joined: Jul 2019
Posts: 38
Ohio
Just to update the gas Gauge has started working correctly now. I think the float was stuck due to the van sitting for two years, it is now working correctly though as I found out by running out of gas lol


Chevy Van G20 3/4 Ton 5.7 L 8 Cyl

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