My car has only one fuel line but I notice that some cars have a return line also. Do I need to add another line or is it okay with one

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Comment by Tony and Ginny 429 on August 20, 2018 at 1:26pm
Do check to see your heat riser at the end of your driver exhaust manifold is opening and closing as it should
You have a video of it working as it should in the -header under Videos

Wire it open if it is not working correctly
Not opening will cause very high intake manifold heat numbers that will vaporize the fuel in the carbs fuel bowls leaving them empty
No gas no start !!

New fuel filter and cleaning the metal screen filter were the gas line goes into the carb if you have debri there
Less than full fuel deliver will have the engine running LEAN and lean means hotter than normal

Good places to investigate

Enjoy
Comment by Tony and Ginny 429 on August 20, 2018 at 11:57am

Check you ignition specs  first 

incorrect timing and worn points will cause heat issue problems ( retarded timing ) 

you need to know the basics are right first  to continue to trouble shoot any engine issues 

enjoy 

Comment by Frank Aragona on August 20, 2018 at 11:32am

First of all, I really appreciate all the members help and vast knowledge. 

At the beginning of the summer season, I had troubles starting the engine, I thought it was old fuel so I added about 5 gallons of 100 octane racing fuel.  Didn't help at all and caused other problems like vapor lock.  The starting problem has been resolved, the choke was not closing fully fixed it so it starts very well now.  But vapor lock issues remain. Higher octane appears to be more susceptible to vapor lock.  I have always run premium fuel and have never experienced vapor lock in miles and miles of crawling at cruises.

Comment by Tony and Ginny 429 on August 19, 2018 at 1:40pm
Russ

I do know the compression Ratio of the 64 429 is 10.5 to 1
Went to the manual as i thought it was the higher number

Now that is high compression but all i have said just prior to this post still applies about 92 or better octane

I would recomend using --Isopropyl alcohol -in the gas tank with ethanol fuels
( ISO-HEET -red bottle at walmart )
Water remover with injection cleaner ( allows moisture in the gas tank to burn thru the engine ) and helps increase gas mileage engine performance and smoothness -- per the lable --And my opinion
Using it for years every few months with great results in hot moist Florida weather in a car that sits a lot
Have never had a need to use an fuel stabilizer doing that
Good results for many years
Just a heads up

Enjoy
Comment by Tony and Ginny 429 on August 19, 2018 at 1:22pm
Frank

Do not run anything but the highest premium gasoline you can find ( or want to afford ) ----92 octane or more
These cars actually run better ( more powerful- better gas mileage ) with the higher octanes that were common when the cars were new ( i was there )

These are higher compression engines and the compression is about as high as you would want it to be on 92 octane pump gas
If you were building an engine to run on pump gas today

Enjoy
Comment by Tony and Ginny 429 on August 19, 2018 at 1:22pm
Frank

Do not run anything but the highest premium gasoline you can find ( or want to afford ) ----92 octane or more
These cars actually run better ( more powerful- better gas mileage ) with the higher octanes that were common when the cars were new ( i was there )

These are higher compression engines and the compression is about as high as you would want it to be on 92 octane pump gas
If you were building an engine to run on pump gas today

Enjoy
Comment by Jason Edge on August 19, 2018 at 10:51am

Frank, per shop manual they recommend approx. 94.5 octane using todays (R+M)/2 pump rating method. For more details Click Here.

Comment by Russ Austin on August 19, 2018 at 10:30am

Frank, the compression ratio is 10:1 and that is high compression.  Check the return line, and then do a fuel pump test per the book. I suspect a weak pump or a carb rebuild.

Comment by Frank Aragona on August 18, 2018 at 9:13pm

I have an A/C equipped 63.  Experienced vapor lock for the first time today at the Woodward dream cruise.  Had to pour fuel in the carb to get it started again.  Was only mid 80's but just crawling.  Never had this problem before, I am thinking premium fuel is probably bad for this low compression engine.  Any thoughts?

Comment by Tony and Ginny 429 on June 7, 2015 at 7:06pm
My vapor line has been disconnected for over 35 years
No problem with vapor lock at all , and I live in the Florida heat

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