I have had this ongoing issues with my 88 SWB Raider. When I fill the gas tank the fuel gauge will read full, but the gauge falls much faster than the fuel level. By about 90 miles the gauge reads fully empty, though I generally go a bit past 250 miles on the trip odometer before I refill the tank. It's not huge deal and the trip odometer approach has been working for the last two years, just wouldn't mind fixing the issue if it's not an expensive fix.

I was leaning toward the fuel sending unit as the culprit and have seen them for about forty bucks shipped. That seems OK, but I prefer refurbishing the old stuff on this Raider.

Assuming it is the fuel sending unit, any thoughts on what I would be looking at replacing or fixing on the existing one? I would like to have the suspect components in my hands for a quick turn around fix. Or should I just plan on buying a new one?

Or... what else could it be? I'm open to suggestions here.

Thanks.

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This is definitely a fuel sending unit issue. Available at the dealer still for between $50 and $100.

Not rebuildable? I don't know. <img src="/forums/images/graemlins/wink.gif" alt="" />

At mitsubishiparts.com:

Senders, Fuel gauge sending unit
Montero
List Price : $43.00
Your Price : $32.77

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I just fired up a 88 Montero myself and am having the same issue. The vehicle sat for a coupla/few years before I got it, So I'd imagine there is some varnish issue somewhere. Going to take it out and apart and see what's involved, but in short term if it needs replacing I can bet the odometer system will work out great! <img src="/forums/images/graemlins/notooth.gif" alt="" />

I think that's the place and price I remember seeing, not too bad. But still, there are so many little fixes with this vehicle that I've done (with the help of this site) with just some time and a bit of effort rather than buying new parts.

As far as getting fuel sending units to work, I've only had to work on a couple motorcycle equivalents, which I never did get fixed.

I had the same issue with my pickup a few years ago. I replaced the sending unit and the gauge has worked great ever since.