Edmunds Answers

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  • avatar karjunkie 06/15/10 8:36 am PST

    A relay should not get much hotter than the air around it. Here are two reasons for the excess heat you should check. First, if the fuel pump is demanding more current flow from the battery it can cause the relay to get hot. More resistance in the pump may be due to physical resistance associated with the pump, such as a worn or seized bearing, a clogged filter etc. These are reasons a relay could get hot. Secondly, any poor connection in the wiring harness. The wiring harness under the vehicle which is going to the pump has a connector that if loose or corroded will lead to overheating at the relay and poor performance of the fuel pump. Check all your connections and change the fuel filter if it has been awhile since it was replaced. If all else fails, then you may need to replace the fuel pump itself, but try the easy stuff first.

Answers

  • karjunkie 06/15/10 8:36 am PST

    A relay should not get much hotter than the air around it. Here are two reasons for the excess heat you should check. First, if the fuel pump is demanding more current flow from the battery it can cause the relay to get hot. More resistance in the pump may be due to physical resistance associated with the pump, such as a worn or seized bearing, a clogged filter etc. These are reasons a relay could get hot. Secondly, any poor connection in the wiring harness. The wiring harness under the vehicle which is going to the pump has a connector that if loose or corroded will lead to overheating at the relay and poor performance of the fuel pump. Check all your connections and change the fuel filter if it has been awhile since it was replaced. If all else fails, then you may need to replace the fuel pump itself, but try the easy stuff first.

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