Re: [Chrysler300] Electric fuel pump & gas octane

[Mark Souders <MRS954@xxxxxxx>]

I added an electric fuel pump several years ago when my mechanical pump crapped out. I installed it inline, back at the tank, mounted over the rear axle, and quite hidden from view. I removed the mechanical pump, removed the lever, and filled in the housing with PC7. Then re-installed it as a "dummy" pump for appearances. The electric pump flows fuel straight through the mechanical pump and up to the carbs. I have since replaced the dummy with a real functioning pump, for originality. I wired up a hidden, lighted switch under the dash, next to the steering column. It is wired to the ignition-on circuit so that in the event that I forget to turn it off, it will stop when the engine is turned off. The only time I use the electric pump now is after the car has been sitting for more than a week or two. When I turn the key, and turn on the pump, I can hear it pumping. When the sound changes, I know the bowls are full and it's ready to be started.
The pump is an inline generic one from Autozone, and I think it's rated at 6-10 PSI. I think if you go higher in PSI you'll need a regulator.  

Mark Souders
300H
Mohrsville, PA


-----Original Message-----
From: Donald Nissen <fast-ace@xxxxxxxxxxx>
To: 300 Group <Chrysler300@xxxxxxxxxxxxxxx>
Sent: Thu, Apr 4, 2013 1:52 pm
Subject: [Chrysler300] Electric fuel pump & gas octane


I would like to add an electric pump to be used as a boost pump for starting. It 
ould then be shut off and the mechanical pump would suck the gas through the 
lectric pump. I know many owners  have done this, but my question is: Would the 
alves in the electric pump restrict the gas flow enough to starve the engine at 
igher speeds? Might it cause it to run lean? Our engines are thirsty beasts 
fter all. Question 2: Is it necessary to use an octane boost additive to 
ompensate for the crappy alcohol fuel we are forced to use? Or is it necessary 
o retard the timing some to compensate? Any consensus thinking?    
on Nissen  300K



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