Re: {Chrysler 300} Check valve

That sounds correct to me- the hot soak thing is real with this modern gas it would seem- just boils right off, making it harder to start next time since the pump has to refill the bowl next time. The fuel pump has to have a check valve of sorts built in or it would pump back into the tank with the return stroke of the pump arm.

One thing I discovered on my 64 imperial with a 413- the fuel pump pushrod was worn down to the point that the stroke was so short, the pump was essentially taking "tiny sips" when cranking. It therefore had an ether habit be ause if it popped over, the pump took several fast sips really quickly and overcame this issue. Just enough of a wear to cause this. (Ironically the exact same thing was happening to Dulcich and Frieburger on the Roadkill Duster they were driving at the track...)

Add the fact that it's a long 4 door Lebaron, it would take forever to crank over. Wore out a bendix actually. A new push rod ( i think from from Mancini) resolved that issue.

Kevin

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From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> on behalf of John Grady <jkg@xxxxxxxxxxxxxxxxx>
Sent: Monday, January 6, 2025 11:14:53 AM
To: Dan Plotkin <dplotkin@xxxxxxxxxxxxxxxxxxx>
Cc: Club International Chrysler <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: Re: {Chrysler 300} Check valve

Also gas cannot drain back out of carb , inlet valve is above the fuel level , you would just pull air . fuel evaporates via “hot soak “ after turn off , imho

> On Jan 6, 2025, at 11:34 AM, Dan Plotkin <dplotkin@xxxxxxxxxxxxxxxxxxx> wrote:
>
>
>
> -----Original Message-----
> From: Dan Plotkin [mailto:dplotkin@xxxxxxxxxxxxxxxxxxx]
> Sent: Monday, January 6, 2025 11:34 AM
> To: 'Richard McFarland' <firemc1958@xxxxxxxxx>
> Subject: RE: {Chrysler 300} Check valve
>
> Are you concerned about a check valve because you believe that hard cold starts result from fuel draining out the carb, back to the pump and back to the tank?
>
> Cold hard starts, especially with the AFB are dry bowls. After I watched Bob Merritt prime a carb through the bowl vents I never seemed to have another hard cold start caused by a fuel pump check valve problem...
>
> Danny Plotkin
>
> -----Original Message-----
> From: 'Richard McFarland' via Chrysler 300 Club International [mailto:chrysler-300-club-international@xxxxxxxxxxxxxxxx]
> Sent: Monday, January 6, 2025 10:25 AM
> To: Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
> Subject: {Chrysler 300} Check valve
>
> Hey just a thought. Thinking of installing an inline electric fuel pump to avoid cranking forever when the car has sat for a while. Was thinking ,why not put a check valve inline between the mechanical pump and carb? Thoughts? Any reason this wouldn’t work?
> Thanks
> Sent from my iPad
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