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

[MRS954@xxxxxxx]

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.
Something else that occurred to me was the problem I had with the pump push rod.  My engine builder "forgot" to replace my original push rod and it wore out.  It wore at the camshaft end and eventually got too short to operate the pump arm sufficiently enough to pump fuel at speed.  It eventually crapped out on me.  I installed an in-line electric pump (hidden just outside the tank).  I have since replaced the mechanical pump and push rod, and now I use the electric pump as a back-up if needed. With the new rod and new pump, it starts after sitting for a week with about 5 seconds of cranking.  If it sits longer than a week, I use the electric pump first to prime the carbs. 
Just my 2 cents.
 
Regards,
Mark Souders
300H
Mohrsville, PA
 
 
 
-----Original Message-----
From: crossram@xxxxxxxxxxxxx
To: Chrysler300@xxxxxxxxxxxxxxx
Sent: Tue, 18 Jul 2006 10:33 PM
Subject: [Chrysler300] replies to query re: fuel drainback


Thanks all for the replies, some private, some on the list. More than a few
members have indicated that the fuel pump is at fault and allows fuel to
drain back to the tank. Also suggested installing an in-line check valve
such as John Deere # RE54244 . This makes perfect sense to me, and I will
try it. Thanks all for the various inputs. 

John Hertog

Sag Harbor NY

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