Question about 1999 Isuzu Rodeo

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Fuel Gauge Problems

I have a 1999 Isuzu Rodeo with the v6 in it. The gas gauge does not work right. I have done some reasearch and everyone says that it is the fuel sending unit. I have called around and they said that you have to buy the whole pump assembly which is like 181.00 and people have told me that you can buy the fuel sending unit for $50-$80. Can any one tell me where to get a fuel sending unit. Thanks

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  • jeffacompton Apr 29, 2009

    mine is a 94 rodeo 6 cyl that leaks fuel from the sending unit. It has 2 pinholes that rusted through metal line that come up out of the sending unit. I can only get it with the fuel pump. Well i already got a new fuel pump so I don't want to do that again. I need a welder or someone to sodder or something.

  • curtis chappel Jun 16, 2013

    they have a gas tank play dough type stuff it works great i had the same problem



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Hey there. Well, I had the same problem on a 1999 Isuzu Rodeo. I thought I'd take the easy out and just replace a fuel sending unit. Don't waste your time. Swap out the entire fuel pump. Go to your favorite autoparts store (Autozone) and ask for them to price the fuel pump. There will be options, get the part number for the cheap one ($80 Airtex, I got mine from a place in Miami). Look up the part number on ebay and buy it for about $80 complete. Spend the money and get a new fuel filter from parts store as well as a Haynes repair manual for the truck. Follow the instructions for fuel pump removal in section 4. You should have a degree of confidence on auto repair or take is straight to a reputable shop. You do need to do some very important things (relieve fuel pressure, drop the fuel tank with the truck on high ramps or jack stands, etc.). This is NOT for the novice. Otherwise, expect the task to take 4 to 6 hours if you don't have a lift. A shop should charge 1 1/2 hours labor and cost of the pump - you need to ask yourself what your time is worth.

Good Luck
Donnie Torok

Posted on May 01, 2009


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There could be a poor connection or an open circuit between the power control module and the fuel gauge sender, or the fuel gauge sender itself is bad. The sender is mounted to the gas tank and usually can be replaced without dropping the tank.

Apr 11, 2011 | 1999 Isuzu Rodeo

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My 1999 Isuzu Rodeos gas gauge shows empty with gas light on all the time even when full . has worked once in last week but very slow coming up

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1998 Isuzu Rodeo 6V, My Gas Guage does not work...what do I need to do?

Hello i had the same issue my gas gauge did not work and i had a bad fuel pump ,i ended up replacing my pump and realized the pump has 2 units attached to it one is the sending unit for the gas and the other the gauge level ,i encountered an issue when i swapped out the old pump for my new pump the gauge did not work any more after replacing,so i investigated after ruling out any wiring defect ,i made sure the pump was properly connected in its self the pump has a connector between the sending unit and the gauge level, and after that i realized the bcm, ECM, or vcm how ever its called (the computer) for my vehicle needed to be re-flashed completely for it to see the new pump... i never would have thought the main computer could not end up just detecting it automatically, all 98 and 99 must under go a re-flashing when any fuel pump is disconnected and replaced... hope that helped...

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1 Answer

Gas tank/ gas gauge

What does your manual say that it is? Always check in your manual and you will have plenty of information to help solve your questions. However, I want to venture a guess about your gas gauge. You may have a computer mis-read and the new tank install is not interfacing with your computer.

Jun 29, 2009 | 1999 Isuzu Rodeo

1 Answer

Smog test will not pass

This code is send (in your case NOT SEND)
by the fuel sending unit.

Does your fuel gauge give incorrect of jumpy reading when it's full?

The quick fix is STOP TOPPING OFF the fuel tank when you are get gas.

Keep topping off will push the fuel tank float off it's sensor limit and eventually short or send OUT OF RANGE reading to the fuel gauge.

Fill your truck up to 3/4 tank full.

Drive it for 2-3 days or about 100 miles.
(this will fill the ready-ness data that DMV want)

If there is NO check engine light ON during the 2-3 days then give the smog test another shot.

DO NOT add fuel unit you complete the smog test.

The CORRECT method to fix your problem is to drop the gas tank and replace the fuel sending unit.

If you truck has over 140,000 miles on it then I will recommend you the change the WHOLE integrated fuel pump/fuel sending unit and fuel filter at the same time.

Jun 02, 2009 | 1999 Isuzu Rodeo

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