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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
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Lincoln - Mercury
  Jim Grant's Tech Tips

'91 Isuzu Rodeo, Road Side Casualty

Q: My ’91 Isuzu Rodeo died while I was on the highway with no warning lights, noise or any other warning. After I pulled over, I tried to re-start. The engine barely turned over. It sounded like a dead battery. I replaced the battery and the car cranked. I drove it home (approx 10 miles) with no problem. After I got it home, I killed it and it restarted with no problem. I let it run for a few minutes and tried the same thing again. Dead battery sound again. The next day I started the car and it started immediately but only ran for a few seconds. I did that two more times. Now it sounds like it is running out of gas. I think something is shutting it down but I have no idea what that could be or how to go about figuring it out. The last car I knew how to repair was a 350 Chevrolet. Oh yeah it has 250k miles.

A:You may just have a charging system problem. When you turn the key to crank/start the engine on your vehicle a signal is sent to the fuel pump relay to supply power to the fuel pump. Once the engine is running, you let off the key so it returns to the run position. At this point two things happen; the fuel pump relay loses the signal from the ignition switch to power the fuel pump. The fuel pump relay then receives a signal from the alternator to supply power to the fuel pump. Your vehicle just happens to need a good working alternator for the fuel pump to work. This system was not used on many vehicles but in your case, a new alternator should turn your fuel pump back on.

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