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If you can run a voltage test to make sure everything is working you'll find that it has a very low voltage simply because your unit is submerged in fuel. But this will tell you that your ECU is receiving some kind of signal; however, what is being outputted is different so you need to take your rodeo to a Isuzu dealer and even tho a passport is the same car Honda dealers can't do it.

An Isuzu dealer can be hard to find at times because some dealers will sell Isuzu but not be certified Isuzu dealers, I know that sounds wierd. Anyways If you've replaced it and checked the wiring and know everything is ok then there are 3 codes that need to be programed into your ECU to fix your fuel sending unit and this can only be done at a dealer

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Q: You have replaced the fuel pump in your 98 Isuzu rodeo and gas light is still on what else could be the problem?
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