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I had an electric pump installed near the tank of our C-300 and just left the rest of the plumbing intact. As I was taking the sold car out to the buyer, I stopped to take one last picture and noted a puddle under the front. There was a gasoline leak at the inlet side of the fuel pump. That hose was normally at atmospheric pressure and was now pressurized. A clamp had lost its clamposity due to crushing of the rubber flex hose between the fuel line and the pump. Lesson: If a pump is installed, make sure all hose, fittings and connections can take the pressure. I really liked the way the system worked as I could hear the pitch of the electric pump change when the floats raised and shut off flow. Float chambers were full. One or two pumps of the accelerator and good to go. I originally had the pump on a push-button and used it for priming at start time, only. I found the presence of the non-running pump was causing enough restriction that the engine was starved. A hemi at full song is THIRSTY. Running both pumps in series solved that problem. I understand that some pump designs are better than other regarding restriction when not running. Duly noted that failure of a diaphragm in this lashup would likely allow raw gasoline to flow into the oil pan. The solution below would be preferable to just having the two pumps in series while looking more original than just having the pump sit there or removed and blocked off. Rich Barber Brentwood, CA From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'Rob Kern' robkern@xxxxxxxxxxxxx [Chrysler300] I love it! Got those concours judges..didn’t you?! Have a Happy and Safe 4th! Rob From: Mark Souders Sent: Tuesday, July 04, 2017 7:50 PM To: 'Rob Kern' ; mgoodknight@xxxxxxxx ; 2HsandaHeritage@xxxxxxxxxxx Subject: RE: [Chrysler300] ethanol-eaten fuel pumps Rob, When I revised my 300H, I did the same thing you did. I carried it one step further by “modifying” my mechanical fuel pump. I removed the pump, removed the pump arm, and filled the inside area where the pump arm pivots with PC7 (two-part epoxy mixture). I made a gasket to cover the whole pump where it seats on the block, and re-installed the pump. I connected the fuel lines to the “dummy” fuel pump to make it look original. It never gave me any problems. Mark From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'Rob Kern' robkern@xxxxxxxxxxxxx [Chrysler300] Hello 300’ly to all! ANATHEMA!! I gave my 300C fuel pump that worked swell to John Begian for his C project for the cost of shipping and replaced it with a 5 psi electric pump from Hemi Hot Heads. It is a non-racing pump that is engineered for dual carb hemis. I located it on the frame rail where I had my electric priming pump in front of the passenger rear wheel with a stone guard beneath it. I insulated it from the frame rail with a rubber pad so it doesn’t make a racket like a woodpecker on the roof. The major reason was vapor lock. The 392 mechanical pump is just beneath the exhaust manifold and the metal lines go right next to it on the rise to the front fuel bowel and hug the water pump area for the upper radiator hose connection. I am fortunate to purchase ethanol free unleaded 91 octane easily in Lawton, Oklahoma. Still modern fuels burn up to 200 degrees F hotter than the ones formulated back in the time of the early letter Cars. There is a reason that fuel pumps I now realize are in gas tanks or away from the engine compartment . Probably the vapor reclamation (EGR?) circuit in modern vehicles has something to do with the location also. Soooo.... the engine starts up immediately since the pump turns on when ignition key turned to on before engaging the starter, pure gas, no diaphragms to fail (near and dear to a soon to retire gyn, 27 days to go), and smooth driving at all speeds and all temperatures without any hiccups. You purists can do your thing, but here is a solution that works well but is not concours correct. Rob Kern From: 'mgoodknight@xxxxxxxx' mgoodknight@xxxxxxxx [Chrysler300] Sent: Tuesday, July 04, 2017 1:46 PM Subject: Re: [Chrysler300] ethanol-eaten fuel pumps Maybe I'm just lucky. I've been dealing with fuel system adversities for more than 50 years and I don't find things to be a great deal worse now than in the past. I've not checked the alcohol content in local fuels in a long time now, but I suspect that here in Florida we still have less of it than in many parts of the country. Between 1995 and about 2004 I never saw local content to be greater than about 6percent (measured with a rather crude test device, careful monitoring required because of 2-stroke sensitivity). My sense of smell is not very acute, but it seems that now we have less ethanol than at some times in the past because I hardly smell it at all now most of the time. A few months ago I disassembled the fuel pump on my C300 just to make certain that it was still in good shape before driving to Wisconsin. What I found was no noticeable deterioration of the diaphragms and it remained clean and corrosion free internally. The pump was a new Airtec from Carquest in 2008. I drive the car a little bit almost every day, refuel it about once a month, and have now accumulated just over 21,000 miles since I started driving it. There's little for me to complain about. ---------------Marshall Goodknight
I also have had 2 fuel pumps rebuilt by Arthur Gould in New York - no problems. Doug Warrener From: "leslie miklas ldmiklas@xxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx> Three different 300s and 3 ethanol-eaten fuel pumps. They worked long enough to push the diaphragm chunks up and clog the lines. Has anybody had any luck finding ethanol resistant fuel pumps or can recommend a rebuilder using ethanol resistant internals ????? Thanks Jeff Miklas
__._,_.___ Posted by: "Rich Barber" <c300@xxxxxxx> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to https://groups.yahoo.com/neo/groups/all/manage/edit For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang __,_._,___ |
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