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New Fuel Pump Issues *gauge not working*

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Old 06-12-2018, 06:05 PM   #1  
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New Fuel Pump Issues *gauge not working*

I recently dropped my axle , and put in a new tank and fuel pump. (from rock auto)

After putting it all back together and putting $10 of gas in , i noticed the gauge didn't move.

Concerned, i drove to the gas station and got another $30 gas. The needle went up but barely at all.

What could be the problem?

Do i have to return the fuel pump?
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Old 06-13-2018, 12:24 AM   #2  
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Re: New Fuel Pump Issues *gauge not working*

Maybe the float got caught up on the tank wall or something. I just replaced pump also on my 88 2.8 but I went with the trap door method. Gauge still works fine. Naaa its not the fuel pump that's the problem it's the sending unit or float. This is exactly why the trap door method is the best, If there's a problem you can get in there quick and fix it. But when you drop the tank you have to make sure everything is good to go before you put everything back together. Now........ I know you don't wanna drop the tank again.

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Old 06-13-2018, 09:58 AM   #3  
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Re: New Fuel Pump Issues *gauge not working*

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Originally Posted by maroe624 View Post
Maybe the float got caught up on the tank wall or something. I just replaced pump also on my 88 2.8 but I went with the trap door method. Gauge still works fine. Naaa its not the fuel pump that's the problem it's the sending unit or float. This is exactly why the trap door method is the best, If there's a problem you can get in there quick and fix it. But when you drop the tank you have to make sure everything is good to go before you put everything back together. Now........ I know you don't wanna drop the tank again.
Luckily I made a trap door !

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Old 06-13-2018, 10:54 AM   #4  
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Re: New Fuel Pump Issues *gauge not working*

Before you pull anything again unplug the connector between the body and the fuel tank. Take a resistance reading from the negative wire and the sending unit wire. Should be between 0 and 90 ohms. Your measuring the fuel tank side BTW. See if that reading matches the fuel gauge. 0 is empty, 90 is full and infinite is an open
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Old 06-13-2018, 11:17 AM   #5  
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Re: New Fuel Pump Issues *gauge not working*

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Before you pull anything again unplug the connector between the body and the fuel tank. Take a resistance reading from the negative wire and the sending unit wire. Should be between 0 and 90 ohms. Your measuring the fuel tank side BTW. See if that reading matches the fuel gauge. 0 is empty, 90 is full and infinite is an open
I put in about $30Canadian in and then another $10 today and it went up. Just a bit though . When tank was empty gauge said below empty. When there was $30 in it said empty. And another $10 made it go up a hair. So it’s reading.
If I fill it up and it says say example “half tank” and I know it’s full.. what do u think the problem would be
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Old 06-13-2018, 04:30 PM   #6  
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Re: New Fuel Pump Issues *gauge not working*

bad sending unit wire grounding
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Old 06-14-2018, 08:18 AM   #7  
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Re: New Fuel Pump Issues *gauge not working*

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Originally Posted by krismarsel1 View Post

I put in about $30Canadian in and then another $10 today and it went up. Just a bit though . When tank was empty gauge said below empty. When there was $30 in it said empty. And another $10 made it go up a hair. So it’s reading.
If I fill it up and it says say example “half tank” and I know it’s full.. what do u think the problem would be
Checking the resistance at the tank will tell you if it is the sending unit (tank side) or wiring or gauge (body side of equation)
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