Re: [Chrysler300] Carter Carb 300K Problems
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Re: [Chrysler300] Carter Carb 300K Problems





Good morning all!  Today is the day that we test our 300K with the gas can and fuel line, bypassing the gas tank etc.

If we are still starving for gas under acceleration then I think I need to look at a new carburetor.  We have already put in a carb kit on the original Carter 3641S and it has been completely cleaned.

Any suggestions on a new carb replacing the original?  I will keep the original for a future owner.

Thanks everyone, this has been a great resource for us.  Mark

Mark G. Miller, General Manager
Arthur L. Davis Publishing Agency, Inc.
ph. 800-626-4081 ext. 1303  cell 319-240-8083
f. 319-277-4055





On Oct 8, 2015, at 8:48 PM, RICK AND DEBBIE CLAPHAM rixpac@xxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:


   I have experimented with a 'production heat shield, an aluminum plate' and a .375 thick plywood spacer. I was testing the use of an AVS Carburetor 750 CFM, this worked very well on our 1984 W350 crew cab. I went back to the original Thermo-quad, and have no problems.
 
    Did not block off the carb heat cross over. We get some cold weather here. I also run the carb air preheat.
 
    Bypassed stock fuel pump, using carter electric with oil pressure controlled switch and crank bypass.
 

To: finsruskw@xxxxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
From: Chrysler300-noreply@xxxxxxxxxxxxxxx
Date: Thu, 8 Oct 2015 11:52:17 -0700
Subject: RE: [Chrysler300] Carter Carb 300K Problems

 

It would seem that carb and intake manifold heat may be contributing to the problem.   Has anyone experimented with insulating spacers under the carbs or blocking off manifold heat?  Assuming that fuel in the secondary bowl is constantly boiling, we might expect residue and crud to build up and that the light ends of the remaining fuel would be gone—leaving a lower vapor pressure blend of unleaded gasoline with lower octane number.

 

Refineries will be switching to winter-grade fuel soon—even higher vapor pressure.  Fuel injected cars don’t seem to be as affected as do our CARbureTER’d cars.  Although, even our FI Hemi-Rango seems to crank a bit long sometimes in hot weather—as if the liquid fuel in the system had vaporized.

 

Rich Barber

Brentwood, CA

 

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'David Schwandt' finsruskw@xxxxxxxxxxxxxxx[Chrysler300]
Sent: Thursday, October 08, 2015 8:00 AM
To: chrysler300@xxxxxxxxxxxxxxx Club <Chrysler300@xxxxxxxxxxxxxxx>
Subject: [Chrysler300] Carter Carb 300K Problems

 
  


Subject: RE: [Chrysler300] Carter Carb 300K Problems

Sounds like the same problem I'm having w/my F.
Only it usually rears it's ugly head under high temp conditions.
I took it out last week one day and rung it out pretty good, temps were in the high 60's, w/no stumble or acceleration problems at all.
Same car, temps in the 80's and 90's like we were experiencing at Mcungie, car runs like crap after the 1st 5 miles or so, when it gets warmed up.

Dave Schwandt

-----Original Message-----
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of 'John Grady' jkg@xxxxxxxxxxxxxxxxx [Chrysler300]
Sent: Thursday, October 08, 2015 9:52 AM
To: 'donald cole'; 'Mark Souders'
Cc: 'Mark Miller'; 'Ryan Hill'; 'Michael Moore'; 'Greg'; Chrysler300@xxxxxxxxxxxxxxx
Subject: RE: [Chrysler300] Carter Carb 300K Problems

That really makes a lot of sense to me, Don—great input ; not enough fuel moved. And clean inlet stuff.

John

From: donald cole [mailto:mr300k@xxxxxxxxx]
Sent: Wednesday, October 07, 2015 9:01 PM
To: Mark Souders
Cc: Mark Miller; Ryan Hill; John Grady; Michael Moore; Greg; Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Carter Carb 300K Problems

I had the same problem with my RAM K a few years ago and what I did was get a high volume mechanical pump from Summit. Problem went away.

Don Cole

On Oct 7, 2015, at 5:50 PM, 'Mark Souders' MRS954@xxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Mark,

Is your fuel tank vented? Do you have a vented cap?

Mark

From: Mark Miller [ <mailto:mark@xxxxxxxxxx> mailto:mark@xxxxxxxxxx]
Sent: Wednesday, October 7, 2015 5:19 PM
To: Ryan Hill < <mailto:ryan_hillc300@xxxxxxxxxxx> ryan_hillc300@xxxxxxxxxxx>
Cc: John Grady < <mailto:jkg@xxxxxxxxxxxxxxxxx> jkg@xxxxxxxxxxxxxxxxx>; Michael Moore < <mailto:mmoore8425@xxxxxxx> mmoore8425@xxxxxxx>; Greg < <mailto:picgrego@xxxxxxx> picgrego@xxxxxxx>; Mark Souders < <mailto:MRS954@xxxxxxx> MRS954@xxxxxxx>; <mailto:Chrysler300@xxxxxxxxxxxxxxx> Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] Carter Carb 300K Problems

I will check the fuel pressure numbers again, I am working off of the mechanic’s notes. We will talk another shot at this and try these new ideas and will post again. 

The car shows 65,000 but we do not know if original and how many since rebuild. 

Thanks, Mark

Mark G. Miller, General Manager

Arthur L. Davis Publishing Agency, Inc.

ph. 800-626-4081 ext. 1303 cell 319-240-8083

f. 319-277-4055

<http://nursingald.com/> nursingALD.com * <http://aldpub.com/> ALDpub.com

On Oct 7, 2015, at 2:50 PM, Ryan Hill < <mailto:ryan_hillc300@xxxxxxxxxxx> ryan_hillc300@xxxxxxxxxxx> wrote:

That fuel pressure is way too high. Did you replace the accelerator pump on the carb, some kits don't include them. You must be getting a good shot of fuel as the throttle is opened. Dried, flawed, dirty, or improperly adjusted pump plungers can cause starvation on hard acceleration and not provide enough fuel at startup.

Are you confident your ignition system is sound? How many miles on the rebuild? 

Just in case you needed to know, this was sent from my iPhone. 

On Oct 7, 2015, at 12:33 PM, 'John Grady' <mailto:jkg@xxxxxxxxxxxxxxxxx> jkg@xxxxxxxxxxxxxxxxx [Chrysler300] < <mailto:Chrysler300-noreply@xxxxxxxxxxxxxxx> Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

That seems way too high? Isn’t it about 5-6 psi max? Cannot be right? But unrelated to starvation

From: <mailto:Chrysler300@xxxxxxxxxxxxxxx> Chrysler300@xxxxxxxxxxxxxxx [ <mailto:Chrysler300@xxxxxxxxxxxxxxx> mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Mark Miller <mailto:mark@xxxxxxxxxx> mark@xxxxxxxxxx [Chrysler300]
Sent: Wednesday, October 07, 2015 2:22 PM
To: Michael Moore
Cc: Greg; Mark Souders; < <mailto:Chrysler300@xxxxxxxxxxxxxxx> Chrysler300@xxxxxxxxxxxxxxx>
Subject: Re: [Chrysler300] Carter Carb 300K Problems

Hi Mike, the old fuel pump was tested at 10-14 psi with good fuel flow but we replaced it because it was leaking oil next to the block and was a inexpensive fix. Thanks Mark

Mark G. Miller, General Manager

Arthur L. Davis Publishing Agency, Inc.

ph. 800-626-4081 ext. 1303 cell 319-240-8083

f. 319-277-4055

<http://nursingald.com/> nursingALD.com * <http://aldpub.com/> ALDpub.com

On Oct 7, 2015, at 1:13 PM, Michael Moore < <mailto:mmoore8425@xxxxxxx> mmoore8425@xxxxxxx> wrote:

Mark,

I am also interested in this issue. I am wondering why can’t we test pump fuel delivery by pumping gasoline from the fuel pump into a container and measure the volume over time?

Do we know how much gasoline that pump should deliver in say, 30 seconds? I can imagine doing that would be an easier test

Thanks, Mike Moore

On Oct 7, 2015, at 10:57 AM, Mark Miller <mailto:mark@xxxxxxxxxx> mark@xxxxxxxxxx [Chrysler300] < <mailto:Chrysler300-noreply@xxxxxxxxxxxxxxx> Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

First, many thanks for all of the advice I received last week on this problem!

Okay, still having some problems with fuel delivery on our 300K.

Here is a quick rundown on what we have had done. Carb was cleaned and fitted with a new carb kit. Floats were set at 23/32 spec?

Items replaced: Fuel pump, fuel pump push rod, fuel filter and all rubber fuel lines.

Fuel tank was removed and sending unit inspected. Blew out fuel lines.

After all of this we still are starving for fuel when the 4barrel kicks in. Also a little harder to start and (at times) some throttle hesitation on normal acceleration.

One question the mechanic had was the engine rebuilt with bored cylinders etc and needs a higher CFM carb. I do not have any history on the engine other then it has been rebuilt.

Any help will be much appreciated! Mark

Mark G. Miller, General Manager

Arthur L. Davis Publishing Agency, Inc.

ph. 800-626-4081 ext. 1303 cell 319-240-8083

f. 319-277-4055

<http://nursingald.com/> nursingALD.com * <http://aldpub.com/> ALDpub.com

Let's assume the problem is not with the carb.

There are 3 pieces of "rubber" fuel line in the system.

If they are old, they need to be replaced to 

ensure you aren't drawing air into the system through an

age crack in the old hose, or perhaps a blockage in the hose.

One is at the fuel tank, connects the sender to the pipe.

One is in the area of the front passenger foot well, connects

the pipe to the next pipe.

The other is from that pipe to the fuel pump inlet. 

It is a pretty easy job to replace these pieces with new line.

I think the diameter is 5/16". 

It could be the problem is with the fuel sock on the sending unit. If

the tank has rust in it, the sock will plug. While it isn't a terrible job to

get the sending unit out, it takes a while. 

If you suspect the sock, but would rather not get into the sending unit, 

you could try running the car from an aux fuel tank. Run a long

piece of fuel hose from the fuel pump inlet to an aux tank which

you could place in the pass front seat. Have someone hold the aux tank

so you don't get spills. If the carb performs off the aux tank system, you

know where your fuel restriction is (or isn't).

On Oct 1, 2015, at 10:42 AM, Greg < <mailto:picgrego@xxxxxxx> picgrego@xxxxxxx> wrote:

Sounds like your floats are set to low. 

Sent from my iPhone

On Oct 1, 2015, at 11:25 AM, "'Mark Souders' <mailto:MRS954@xxxxxxx> MRS954@xxxxxxx [Chrysler300]" < <mailto:Chrysler300-noreply@xxxxxxxxxxxxxxx> Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

Mark,

If I had to guess, and based on past experience, I’d say your fuel pump push rod is worn, and can’t push the fuel pump arm enough to feed ample gas to the carb. Ask me how I know this.

Happy Moparing,

Mark

From: <mailto:Chrysler300@xxxxxxxxxxxxxxx> Chrysler300@xxxxxxxxxxxxxxx [ <mailto:Chrysler300@xxxxxxxxxxxxxxx> mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Mark Miller <mailto:mark@xxxxxxxxxx> mark@xxxxxxxxxx [Chrysler300]
Sent: Thursday, October 1, 2015 8:29 AM
To: <mailto:Chrysler300@xxxxxxxxxxxxxxx> Chrysler300@xxxxxxxxxxxxxxx
Subject: [Chrysler300] Carter Carb 300K Problems

Hi, I have a new to me 1964 300K with the single Carter 3614S 4 barrel carb. The carb is starving for fuel when I kick in the seconda ry. I just had the fuel system checked out and there are no kinks, fuel filter is new, fuel pump has good pressure and had the carb rebuilt with a new kit and the carb tests fine. The secondary kicks in but the car surges as it starves for fuel. Under brisk but normal acceleration the engine runs fine. Any suggestions would be much appreciated! Thanks Mark

Mark G. Miller, General Manager

Arthur L. Davis Publishing Agency, Inc.

ph. 800-626-4081 ext. 1303 cell 319-240-8083

f. 319-277-4055

<http://nursingald.com/> nursingALD.com * <http://aldpub.com/> ALDpub.com

[Non-text portions of this message have been removed]

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Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
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Posted by: Mark Miller <mark@xxxxxxxxxx>


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