I have a 94 GC and the gas guage shows all different readings; will show 1/4 tank and then 10 minutes later it stays near empty. it also only goes to 1/2 when it is full. Is this a sending unit malfunction or the guage ? thanks for your help...

 

my suggestion is to buy a complete fuel pump i have to do the same thing my zj only has 82000 on it but the check valve is bad so im just gunna replace the whole fuel pump there only like 100 bucks rather do it now than getting stuck on the side of the road

 

Ummm - thanks for the help but it is not a fuel pump issue - the gas guage is just screwy and does not give an accurate reading at any time - just wanted to know if it is most likely the sending unit or the gauge...

 

Rust in the tank.
Remove the sending unit from the tank, you will find a little plastic cover on the resistor, if you open it you have access to the coil and the little brush, with a little piece of fine sand paper sand the coil and the brush, then with a small screwdriver bend the brush towards the coil to give a little more pressure, put everything back together and tat's t...

 

Very nice - thanks !!!

 

You can buy an in line check valve on e-bay for 5-10$

http://cgi.ebay.com/ebaymotors/Universal-Fuel-or-Vacuum-Check-Valve_W0QQcmdZViewItemQQhashZitem2a021bc8b2QQitemZ 180424001714QQptZPersonalQ5fWatercraftQ5fParts