Steps to diagnose bad fuel gauge.

[NamesReed]

I've got an 88 k2500 6 lug truck. Fuel gauge doesen't work, stuck on E.

What the steps i should go through to diagnose the issue? What are some of the common causes of fuel gauge failure?

Thanks

 

[Supercharged111]

First try a double dose of Berryman's fuel system cleaner, Seafoam, or Techron. If the contacts on the sender are dirty this has a good chance of fixing it or making it less bad.

 

[Urambo Tauro]

It'll take some time for that to work though, so if you want to pursue electrical checks...

I'm not sure how to test the gauge itself, but I believe these senders are supposed to have higher resistance as the fuel level lifts the float. So if you find little-to-no resistance between the sender terminals at the tank connection, that would explain the gauge's empty reading.

 

[magimerlin]

Most gm gauges from the mid 60's till 97ish are 0-90 ohms of I remember right. I wanna say in late 97 early 98 they to go 40-250ish ohm range.

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