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I need to change my fuel sending unit

Tiny
MATTTYW20
  • MEMBER
  • 1990 CHEVROLET TRUCK
  • 130,000 MILES
I have a 1990 Chevy 1500 and I need to change my sending unit I was wondering if someone could give me step bye step instructions to do so tired of never knowing how much gas I have lol beofre when I turned teh sending unit would open now it doesnt even do that so its time for a new one
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Sunday, April 22nd, 2012 AT 11:31 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to drop the fuel tank to gain acess to the top of the tank where the unit is located.

Roy
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Monday, April 23rd, 2012 AT 12:00 AM
Tiny
MATTTYW20
  • MEMBER
  • 113 POSTS
Thats what I figured just undo the two straps along with all the lines and electric connectors now I just wanna make sure of this to be safe can I change the sending unit an kep the same fuel pump thats in there now? Cause theres othing wrong with that so I jus wanna be sure
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Monday, April 23rd, 2012 AT 4:08 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You can but it would make good sense to change it out as you have everything down now.

Roy
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Monday, April 23rd, 2012 AT 10:39 AM
Tiny
MATTTYW20
  • MEMBER
  • 113 POSTS
Thanks in advance for all your help makes sense I'll jusy spend the 180 an buy the whole assembly but my last quention is is it safe to say that its the sending unit maken my gas gauge not work every other gauge works and before when I hit the accelerater it would open then close when i'd stop now its not doing that I put 20 in my tank an I had already has gass in there an my gauge moved a lttle closer t a quarter of a tank so in your experiance before I shell out te money an time do you think thats what the problem is?
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Monday, April 23rd, 2012 AT 1:55 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Check for voltage to the sender unit. On the old trucks, there is a 7 volt signal that pulsates.

Another way is to disconnect the sender connector. The gauge should go to empty or full. Then ground the wire and it should go the other way.

Roy
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Monday, April 23rd, 2012 AT 11:45 PM

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