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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.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'99 Saturn SL2, Failing Fuel Pump Fuse

Q: I got a call from a lady with a ’99 Saturn SL2, telling me that her car isn't starting. I said, I would be right over. When I got there, I decided to check for spark and it was okay. I then checked for fuel. When I did that, I found that there was no fuel pressure. So, I went to the fuse panel and found that the fuel pump fuse was burnt. When I replaced the fuse it burnt as well. From your experience, do you think I should just go ahead and unplug the pump, to see if it still burns the fuse? On the other hand, do you think it maybe something in the wiring system?

- Keith

A: If the fuse that is failing is the 10 amp fuel pump fuse then I would suggest unplugging the fuel pump, replacing the fuse and cycling the ignition switch to see if the fuse fails again. If the fuse does not fail, then it is a good bet that you have a bad fuel pump. If the fuse does fail then you have a wiring problem to diagnose. The 10 amp fuel pump fuse only powers the fuel pump in this vehicle. If the fuse that is failing is the larger 30 amp fuse then your problem is with the fuel pump relay or the wiring from the fuel pump relay to the fuse panel. The fuel pump relay is the switch/gate that sends electricity to the 10 amp fuse for the fuel pump and fuses for the transmission actuators when the key is first turned on and when the engine is running.

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