fuzzy fuel gauge

I replaced my fuel pump sending unit and a week later the fuel gauge started vibrating making it look fuzzy. does anyone have any ideas about what the problem is? It is a '98 z71
Thanks

I have the same problem with my 99 Suburban, I replaced the fuel pump and sender assembly, it happend about 9 months after that. I can't believe someone doesn't have a fix for this

Jeff

When you replaced the in-tank unit, did you also inspect, clean, and re-grease the electrical connectors in the rest of the wiring harness for the pump and gauge? Did you inspect the connector at the top of the in-tank unit itself for problems? They are prone to heating failures:

http://72.19.213.157/files/PumpConnector.jpg

If ALL the connections are intact, there is a "fix" for this. Take up any axial play at the level sensor swingarm bushing by fully seating the bushing in the plastic or adding shim washers , and add some tension to the level sensor contact fingers so they actually make reasonable contact with the circuit traces on the sensor card:

http://72.19.213.157/files/LevelSensor05.jpg

Easy enough?

thanks-
I have been told that the OEM pump assmbly is mush better, so i decided to drop the tank again and replace that AM pump with the oem; this time i will pay particular attention to the connections and use some dielectric grease, i will post after im done to revealt the results. Anyone wondering if they should drop the tank or remove the bed? I think that if you have an empty tank or near empty (less than 1/4) then dropping the tank is actually pretty easy, I did it myself in about two hrs total job time.
Love these forums, they have saved me time and money many times :naughty: :2cents:

Well, I replaced my new AM fuel pump with an OEM pump hoping it would resolve the fuzzy fuel gauge problem but, no luck. However the OEM unit does seem to perform better and is much more quiet. I did inspect the pumps connections and everything seemed normal, i also took extra care to clean and grease the connections. i looked at the float swing arm contacts and it seemed to make good contact. things like vibrating fuel gauges really irritate me, i hope i can find a solution.