1940 Stumbling problem

mike42

mike42

Well-known member
So…….after 6 months of going crazy trying to solve my stumbling problems……..along with a rebuilt carb by Charlie……rebuilt Dist from 3rdgen……..rebuilt Skip Haney Coil and a new Napa condenser……..I finally found that the hose from Fuel Reg to Carb was partially blocked. It’s a fuel hose that has a check valve which does not allow fuel to drain back so it’s easier starting. Apparently the check valve was semi stuck and wouldn’t allow enough fuel to properly flow.

Problem solved and I’m riding again, but now I’ve got almost all new stuff. Life is good in Northern Michigan !

Thx……Mike
 
Glad your car is up and running again. I've never understood the need for a check valve between the fuel pump and carb...the fuel pump HAS a check valve in it, and the carb cannot drain the bowl because the inlet needle is higher than the fuel level. :confused: Whoever made that line did you a dis-service, Mike! But hey... she's in top shape now.:D
 
I wish I could blame on somebody but I was told it was a good idea so I went with it !

All good…..let’s ride !

Mike
 
A leaky power valve will drain the bowl. It's a common phenomenon and the reason there is so much discussion here and elsewhere about alternative sources for Holley power valves.
 
Robert Shewman makes a flex fuel line from the firewall to the fuel pump with a check valve. He can supply the flex line without the check valve also. He advertises in the V8 Times.
 
Terry …….

That’s where I bought the fuel line with the check valve. It worked great for 7 or 8 years and then it didn’t !

Mike
 
If you are in the water main installation business you will likely find a check valve or backflow valve will fail sooner or later. Less is more.
 
Russ…….well it was later and created a headache ! I had checked and replaced everything else and it never dawned on me to check that fuel line with check valve.
 
Mike 42 just a quick note what fuel are you using in the old girl nothing with ethanol i hope that makes for big problems all the time
 
joe 1950 said:
Mike 42 just a quick note what fuel are you using in the old girl nothing with ethanol i hope that makes for big problems all the time
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Another long-held myth? Everyone I know uses regular pump gas in their old cars. All pump gas in the metropolitan area is about 10% ethanol. Never experienced or heard of any problem that could be attributed to the gasoline.
 
Joe……I only use recreational fuel. No ethanol. It costs a bit more but I don’t any more headaches. The check valve fuel line was enough for me !
 
Mike, glad you found a issue. I have used that same line you are refering to by Robert Shewman. Personally if your fuel pump primes well enough I dont think it's needed.

Story time...... I had one on my 1933 and it would stick frequently. All I had to do was tap on it and problem gone. I started running a full bottle of Marvel Mystery oil or Lucas fuel stabilizer in every tank and it never acted up again.
 
35….. with all the problems I had for about 6 months it just never dawned on me to change that line ! After removing and running a regular line the problem instantly went away. It cost me money and time, but problems resolved and I’m riding ! I’ve got new carb, coil and distributor now though !

Thx…..Mike
 
35fordtn said:
Mike, glad you found a issue. I have used that same line you are refering to by Robert Shewman. Personally if your fuel pump primes well enough I dont think it's needed.

Story time...... I had one on my 1933 and it would stick frequently. All I had to do was tap on it and problem gone. I started running a full bottle of Marvel Mystery oil or Lucas fuel stabilizer in every tank and it never acted up again.
Click to expand...

Question, what size bottle MMO?
 
Tudie 36 said:
Question, what size bottle MMO?
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Every fill up on mine I just take whatever size bottle I have and pour a 3-5 seconds worth every fill up!!!! As my grandfather always said "it does ya good and helps you too!!!!" Incidentally I learned it from my Grandfather as he religiously did that with his 59 VW karman Gihia every fill up!!! My lawn mower gets the same treatment, just not as much volume of MMO, obviously.
 
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