Re: [Chrysler300] replies to query re: fuel drainback

[whuff <whuff@xxxxxxxxxx>]

Now I am confused, I never heard of an over-pressure valve on any car 
with a mechanical fuel pump, much less our vintage cars.  Also, I 
believe mechanical fuel pumps (at least the single diaphragm ones) 
actually pump via spring action, with the cam actuated rod providing 
suction rather than pressure.  If that is true, it makes over 
pressurization very unlikely since the spring would tend to weaken 
with age rather than strengthen.

Bill Huff





At 7/19/2006 07:40 AM, MRS954@xxxxxxx wrote:

>Hi group,
>I talked to a mechanic friend last evening about this, because I, 
>too, had a hard start problem after the car sat for a week. He 
>suggested that the fuel pump "over-pressure" valve might be worn. 
>What the heck is that? The way he explained it, I surmised that 
>there is some way that the fuel pressure can bleed back toward the 
>tank if the pump is over-pressurizing the carbs, (for example, at 
>idle) when the pump is pushing more fuel than the carbs need. This 
>could cause an equalizing in the fuel line when the engine is off, 
>and then the pump must work a little harder to build up the pressure 
>needed to start the car.



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