Well I just rolled over my 98 Rodeo (3.2 V6) to 200000 and all of a
sudden it gives me funky gas mileage/readings. In the old days the gas
light would come on and I could put around 16-17 gallons in to fill it
back up but now when it comes on I can only put in around 12 before it
fills back up. I can top it off and drive for about 45 miles and I'm
already at 3/4's of a tank. I've been afraid to test the actual tank
levels for fear of running out of gas, but the actual mileage seems to
be slightly worse but not enough to cause the discrepancy. I keep it
tuned and change the oil on a regular basis... but I'm not enough of a
mechanic to try to figure out what might be wrong. So I thought I'd
check in here first to make sure it wasn't something simple that I could
repair before I take it to the dealer. Any ideas?
I have 98 Rodeo as well. Not nearly so many miles, though. Dang! From the
start, the gauge was a little iffy. Did a little research, and found that
this is a common problem for this model/year. Isuzu is aware, but there is
no fix or TSP for it. I do exactly what you probably do--get to 300 miles
on the 21+ gallon tank, then fill it up (usu 17.9 gallons or so) and reset
the tripometer. Regarding a sudden change in this, maybe just the gauge has
deteriorated to a new and even worse level? Are you still getting the same
actual miles per gallon, just the behaviour of the gauge has changed?
Definitely odd, but too pricey and hit-and-miss to drop the tank and have
the sending unit replaced. Maybe just keep charting your miles and ignore
the gas light when it comes on.
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