You will have to replace the sending unit. That is the part that has a sliding resistor on it. The contacts on that resistor go bad and the sending unit goes on default (empty). The problem is that it is hard to find the sending unit itself. Usually they sell it together with the fuel pump as one item which is quite expensive.
Stephen, and all others with the fuel gauge issue.
I have a 2001 isuzu rodeo. I have had two fuel pumps, now going for a third, replaced. The fuel gauge\fuel pump is one unit. If your experiencing an issue with the gauge then it is all up to you to fix it. If your having issues with your pump, usually seen by fuel gauge not working and shortly afterwards your car running in "reduced power" mode and the "check engine" light coming on and car running very rough. The fuel pump is covered under the power train warranty.
I am the owner of a 99 Rodeo and it is amazing to me how many of the same problems I am experiencing as other posters here. My gas gauge quit working not long after I got it (almost 4 yrs. ago) and now my check engine light comes on, stays on for days, goes off for a short time, then back on. It drives me crazy. Just like the other poster, I have to rely on my mileage to tell me how much gas I have. I just reset my odometer every time I fill up. I have suffered the consequences of running out of gas once. I wonder why all these items were not a recall for Isuzu? I think they should have fixed these things.
I have a 1999 Isuzu Rodeo, 3.2 4wd, manual transmission. Like virtually all owners of this vehicle, my fuel gauge does not work. I am hoping the new sending unit will resolve this. I have also had to replace my EGR and MAF sensor. All-in-all, the vehicle hasn't been too bad. Gas consumption is bad, but nothing like the vehicle's oil consumption! Where does all that oil go?! It's ridiculous.
Ran into others comments searching for my gas gauge problem. Guess I'm not alone! The auto repair place I called said right away it was the sending unit when I described on the phone. The only problems I have had with my 99 Rodeo are the same as most others... had to replace ABS at my cost, oil seems to evaporate, and now my fuel gauge seems possessed... says empty when full and then goes back to normal after driving for awhile. I find it very annoying that these were not recall items covered by the manufacturer.
I was looking for info on the EGR valve for my 99 Rodeo, and I have had the exact same problems as everyone else. I thought I had just bought a lemon, but I guess not. The fuel gauge does not work, the wipers quit working on intermittent, it uses oil like it going out of style, but does not smoke. The ABS is messed up and now the check engine light is on, and they tell me it is the EGR valve. At least I'm not alone.
Have a 2000 Isuzu Rodeo, first the intake gasket started leaking, then the fuel gauge problem like everyone else, and now the intermittent wiper issue and the rear wiper will not operate, is there a relay for this wiper issue?
I had the same three problems with my Rodeo. Luckily for me it was still under warranty. Dealer repaired my gas gauge problem and ABS problem. Unfortunatly, my A/C compressor went out about a month after warranty expired.
I own a 2000 rodeo v6 and 5 speed. I too wonder where all the oil is going and if I will be walking because of the broken fuel gauge. my latest problem is that the 4x4 will not engage. iwould like to say that this is a nice vehicle, but it has been a money pit since day one.
Bought my 99 Rodeo in September, and have been fixing numerous things. Most were because of poor maintenance by previous owners.
Fuel sending unit was bad when I bought it. Can buy a new one from St. Charles Isuzu for $35 with free shipping.
Search the Isuzu forums for ways to take care of the oil burning issue; lots of info. Mine has only burned 1/4 of a quart in 3000 miles.
They are tough and very capable 4x4's when well maintained. Like all vehicles, they have some inherent problems though. Wiper relays can be replaced.
Check the hall of fame section at planetisuzoo.com
Hi, my girlfriends Rodeo is a great car and we love to take it on trips, but the previous owners didn't care for it well. Her fuel gauge doesn't work along with her ABS light is on yet the ABS is working fine. And, her EGR valve is what I think is the cause for her check Eng light. Does anyone know if I have to drop the tank to replace the pump? or if it is accessible through the floor?
To all fellow Isuzu Rodeo owners:
I own a 1999 Isuzu Rodeo LS. It has been running awesome for quite some time until recently. I see that my problems are common among other 99 Rodeos. I will try to go in chronological order of what I've done so far:
Intake Gasket Replacement: I am stationed overseas and had to replace an intake gasket because the truck had a very rough idle and would cut the engine off from time to time.
Fuel Gauge Replacement: I was able to do a search on eBay (98 99 00 01 02 RODEO PASSPORT FUEL SENDING UNIT-NEW OEM PART #8253230110) and found a fuel level sending unit replacement for under 40.00 dollars!
Oil Leak: Seems to be the oil pan gaskets. Seems easy and straight forward.
ABS Lights: I've tried to replace the front ABS sensors and found that the new ABS sensors have a very tight squeeze and are very hard to replace. Banging them in is somewhat working. I am currently trying to find out how to reset the ABS dash light or if there is any kind of diagnostic kit that will help me isolate the problem. I've already tried reset the ABS dash light by driving the truck 5mph X 1/2 mile and that didn't work. I've also disconnected the battery and zip.
If anyone else seems to have a solution, please let me know.
Love the vehicle, but same deal here... Stationed overseas and own a 1999 Rodeo LS. ABS light, faulty fuel gauge, and check engine light are my latest problems. I had to replace the original engine at 55K miles. Prior postings helped answer some of my questions and have given me a good starting point at which to resolve some of the issues I'm faced with. Thanks to all of you who've spoken out before me--you all rock!