Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Why does fuel pressure drops when electric fan turns on
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Old 03-27-2005, 11:13 PM
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This is going to sound really dumb, but have you checked your fuel filler cap? Is possible that it isn't venting and you are getting a "pressure differential lock" that coincidently happens about the time the fans come on. This is why I asked if the pressure comes back up. That mechanical pump, and most likely the electric one too, only pulls about 11"hg suction. If the cap isn't venting, you'll pull that vacuum inside the tank and no fuel will move. Or, if it is only partially venting, reduced fuel flow.


--------------------------------------------------------------------------You must have been reading my mind, you posted just as I wrote this.

Last edited by sbchevfreak; 03-27-2005 at 11:14 PM. Reason: Saw same reply.
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