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fuel pump relay full of water! 200 1986

posted by  Don Foster on  Tue Mar 11 12:29 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
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I can't imagine why condensation would select only the fuel pump relay to the exclusion of other relays. Keep in mind that condensation requires moisture-laden air to enter a cold area -- a spot where the ambient temperature is below the dew point. Only then will water gas become water liquid.

The fuel pump relay has two coils in it which generate a modest amount of heat when they're "pulled in." Moreover, the pump current flowing through the relay creates heat from the contact resistance.

I expect that the fuel pump relays run quite warm. This should depress the %RH inside the plastic housing, preventing condensation.

I think it's more likely that you have a tiny leak somewhere and the water was sneaking along the harness to drip into the relay (capillary action). The proper orientation for that relay is with the tabs downward. This forces the harness into a "U" configuration -- any water should drip off the low spot.
--
Don Foster (near Cape Cod, MA)






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