Re: [Chrysler300] Re: AUXILLARY FUEL PUMP

[retromobilia@xxxxxxxxxxx]

Bob, 
I have had two mechanical pumps on my C fail shortly after being rebuilt. When I took them off they were filled with motor oil due to the diaphragm disintegrating from the ethanol. There is no divider between the diaphragm and the mechanical linkage into the engine. So when the diaphragm opens up the electric pump could pump fuel into the engine. My thought was if I had had an aux. electric fuel pump it would have continued to provide gas to the carb for a short period but it would have also pumped a lot of gasoline into the engine oil. I am not an engineer but my mechanic told me it could do a lot of damage and perhaps explode in the engine. 
I am also concerned that even using a elec. pump as primer to start the engine if it were pumping through the mech. pump; Suppose the diaphragm had disintegrated during storage what would the gasoline do to the engine in the oil before starting or after it would not start. And was left stored that way until it could be fixed.....!!?? 
A proper way to do it may be to do a buy pass with a switch and check or one way valves (isolating the Mech. pump) to use the electric as a back-up and put it on a emergency off switch using a separate oil pressure switch. Everyone seems to agree this is a good idea. 



J D Jung 
Retromobilia.net 

----- Original Message -----
From: "Bob Jasinski" <rpjasin@xxxxxxxxxxx> 
To: "Chrysler300" <Chrysler300@xxxxxxxxxxxxxxx> 
Sent: Friday, October 14, 2011 2:25:05 PM 
Subject: RE: [Chrysler300] Re: AUXILLARY FUEL PUMP 






That's why you use a push button switch, don't leave it turned on, and only 
use it for priming. Sorry to disagree, but I've had an electric pump on my 
G for 30 years and have never had a problem. If you have a failed diaphragm 
in the mechanical pump, the engine won't run. Of course, you could always 
eliminate the mechanical pump entirely if you wanted to, but I don't want 
to. 

Bob J 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto: Chrysler300@xxxxxxxxxxxxxxx ] On 
Behalf Of retromobilia@xxxxxxxxxxx 
Sent: Friday, October 14, 2011 1:33 PM 
To: Ryan Hill 
Cc: Chrysler300 
Subject: Re: [Chrysler300] Re: AUXILLARY FUEL PUMP 


I would never run an electric pump before the mechanical pump because ... On 
numerous occasions when the mech. pump diaphram failed due to mod. fuel it 
allowed a direct passage to the engine oil sump. I cannot imagine what would 
happen if the mechanical pump failed and the electric continued to pump and 
the car did not stop for several miles ........? 

J D Jung 
Retromobilia.net 

----- Original Message ----- 
From: "Ryan Hill" < ryan_hillc300@xxxxxxxxxxx 
<mailto:ryan_hillc300%40hotmail.com> > 
To: paulholm@xxxxxxxxxxxxx <mailto:paulholm%40ameritech.net> , 
chrysler300@xxxxxxxxxxxxxxx <mailto:chrysler300%40yahoogroups.com> 
Sent: Friday, October 14, 2011 11:24:40 AM 
Subject: RE: [Chrysler300] Re: AUXILLARY FUEL PUMP 

Many of us have run electric pumps alone that way without incident but it's 
dangerous if you're running a mechanical pump as well, especially with 
modern fuels that seem to deteriorate the mechanical pumps faster than in 
the good old days. 

Also, if you're running an electric pump full time as your only pump on a 
carburated car, I would think you should have a low oil pressure kill switch 
or inertia switch installed in the event of an accident where the key is not 
turned off. Nothing like having a fuel line rupture and a pump continuing to 
run and spray raw fuel all over. 

Ryan Hill 

To: chrysler300@xxxxxxxxxxxxxxx <mailto:chrysler300%40yahoogroups.com> 
From: paulholm@xxxxxxxxxxxxx <mailto:paulholm%40ameritech.net> 
Date: Fri, 14 Oct 2011 13:54:07 -0400 
Subject: Re: [Chrysler300] Re: AUXILLARY FUEL PUMP 

On 10/14/2011 1:27 PM, Ryan Hill wrote: 
> 
> One important thing to remember when running an auxiliary electric pump 
like this. If the electric pump is left running and your mechanical pump 
fails, you could potentially fill your engine with fuel. (If the diaphragm 
fails, it will leak internally) The damage can be catastrophic! Also, in the 
past, some have mentioned the convenience of having a second pumping source 
to limp home on in the event their mechanical pump fails......this should 
only be done after bypassing the mechanical pump for the same reason. 

> Make sure the pump is being shut off, I would set it up with a push button 
rather than a switch so it's only on when I push it to prime the carb. 

> Ryan Hill 

way back when, we used to just wire the pump to the 'hot when key on' 
source that way if the key was off and out the pump was Not running 

-- 
Paul Holmgren 
Mine: 2 57 300-C's in Indy 
Hers: 05 PT GT R/T HO Stage 1 
Hoosier Corps L#6 

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