I believe the way the electrical pump works on our ’55 C-300 is that it will pump through the mechanical fuel pump when the key is turned on and continue to do so until the bowls are full and the float valve shuts off the input. I can hear the pitch of the pump change when this happens and it make take 15-30 seconds. I know then that the engine is good to go. Give the accelerator pedal a couple of pumps to put some witch’s brew into the manifolds, pull the chokes out by 3/8” on a cold engine and it starts IMMEDIATELY. I don’t know why the manual chokes are on the car but assume it was hard starting while the car was earning its keep in the Colorado Springs area for 30 years. I think my fuel pump is a positive displacement pump, operated by an oscillating solenoid. It must have a bypass built into it to limit its outlet pressure. And, yes, I put my car at risk of a blown mechanical pump diaphragm that would allow gasoline to flow into the block. I did have the electric pump wired to only operate when I pressed an additional push button but the car acted a little starved so I changed it to full time. Now I see the poor operation may have been due to the ignition wire problem previously discussed. Rich B. From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of John Lazenby french_fryguy@xxxxxxxxx [Chrysler300]
Sent: Monday, March 02, 2015 2:19 PM
To: Ryan Hill
Cc: terrymct999@xxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Good thought Ryan but several of my cars don't have electric pumps and they are still failing. John, with all due respect. You were just stating you're replacing your mechanical pumps annually on all but one of your cars. Are you certain it is only due to ethanol? Is it possible the failures are linked to pushing fuel through your mechanical pump while the engine is not cranking or running?
Ryan Hill
To: ryan_hillc300@xxxxxxxxxxx; pffkllc@xxxxxxx; jsnowosacki@xxxxxxxxx; fabe7445@xxxxxxxxxxxxx
CC: terrymct999@xxxxxxxxx; chrysler300@xxxxxxxxxxxxxxx
From: Chrysler300-noreply@xxxxxxxxxxxxxxx
Date: Mon, 2 Mar 2015 21:01:51 +0000
Subject: Re: [Chrysler300]
I've experienced zero problems with electric pumps. Just a curious thought. Are any of you guys experiencing pump failures using electric auxiliary pumps to prime your systems? I know they're low volume pumps that are generally being used but wondered whether pushing fuel through a mechanical pump could do any damage to the valve/diaphram?
Ryan Hill
To: french_fryguy@xxxxxxxxx; jsnowosacki@xxxxxxxxx; fabe7445@xxxxxxxxxxxxx
CC: terrymct999@xxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
From: Chrysler300-noreply@xxxxxxxxxxxxxxx
Date: Mon, 2 Mar 2015 15:37:13 -0500
Subject: Re: [Chrysler300]
Query, does Ethanol erode neoprene as well as lesser materials? I think the newer materials being used to rebuild fuel pumps may be more resistant. Comments will be appreciated. I've gone through numerous fuel pumps lately due to the crummy California gas. I believe I'm replacing them annually on each car now with one exception. Our '53 Imperial Newport still has the original pump and it always works. Now that I've stated that I'm sure it will start to leak. Beyond that I've had no issues. Forgot to mention I also blame modern gas for hotter exhaust temps that cook manifold gaskets faster and dry out valve cover gaskets on the Hurst from close proximity to the HiPo exhaust manifolds.
Sent from my iPhone Check out gas stations around a lake - marine facilities. we live in a lake area and quite a few stations carry ethanol free gas for all the boaters, especially the bass boats with their hi gh HP outboards. Jim in sunny, 71F South Carolina (supposed to rain tomorrow) We've been on max (10%) ethanol in MA for quite a while now, and while it has ruined a couple of fuel lines in weed wackers and chain saws, it does not appear to have damaged any of my 300s. It has messed up the SU style carbs in my 72 MG Midget, as well as the sending unit in the gas tank and the electric fuel pump. There isn't a single station in the state that sells real gasoline.
Sent from my iPhone I just read in Autoweek mag Jay Leno's essay on the evils of ethanol. In my 300F I have been running a mix of 100+ octane leaded aviation gas and pump premium spiked with the normal amount of ethanol. Has anybody in the Club experienced any problems with today's ethanol-infused gas? Jay talks about rubber parts (in fuel pumps, for example) being eaten up and ensuing engine fires. Terry McTaggart
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Posted by: "Rich Barber" <c300@xxxxxxx>
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