Runs 15 minutes then dies and won't start

[davids2toys]

Originally Posted by mrmustang

Honestly, if you are adding 10 gallons to a tank that is currently 1/4 full, you have diluted the ethanol based fuel farther than you would need to be concerned about.
If you have concerns about ethanol, then rebuilding your fuel pump and carburetor, along with replacing your fuel filter (do you have more than one?) would need to be accomplished beforehand. In addition, pulling your fuel pickup out of the tank and checking and more than likely replacing the sock would also be high on my to do list.


Bill S.

Bill,
This is a heat induced issue. The non ethanol gas experiment was to rule out vapor lock due to lower boiling point of ethanol fuel. That is why I want to get the level as low as possible so as to limit dilution for accuracy in the test. I highly doubt this is vapor lock though. If I totally drain tank, does anybody know how much gas it will take to reach the level of the pick up?

[mrmustang]

Originally Posted by davids2toys

Bill,
This is a heat induced issue. The non ethanol gas experiment was to rule out vapor lock due to lower boiling point of ethanol fuel. That is why I want to get the level as low as possible so as to limit dilution for accuracy in the test. I highly doubt this is vapor lock though. If I totally drain tank, does anybody know how much gas it will take to reach the level of the pick up?

Jegs carb heat shield kit


You only need one or two, with gasket material in between.


Bill S.

[davids2toys]

Originally Posted by mrmustang

Jegs carb heat shield kit


You only need one or two, with gasket material in between.


Bill S.

Already has the turkey pan protecting the bowls. The concern is the unprotected fuel lines and fuel log below the turkey pan. This heat shield will be doing the exact same thing as the present turkey pan. Also as have been posted. I have fuel pressure when trying to restart the car after it shut off. The configuration of the fuel log and lines has remained unchanged for the last 10 years of ownership

[tboneheller]

I had a similar issue with mine about 25 years ago. It ended up being a large gauge wire behind the center of the dash that had started melting in the connector. I believe it was one of the wires from the AMP gauge in a 4-wire connector. If I recall correctly, this wire supplies power to the under hood fuse panel. I cut the wire out of the connector, and spliced the two together. Problem solved.

[davids2toys]

That is crazy, how in the world did you find this? I will explore this when I get back to it. Just thinking about this, I have a volt gauge, not an amp gauge.

[Tom Wells]

David,

Just curious: did you get a chance to try the no-alcohol gasoline yet?

Tom

[jts359]

Have you taken the air cleaner off and moved the throttle to see if gas is spraying out of the accelerator pump jet ? On my Supercharged Studebaker there is a tee in the fuel line and fitting with a .047 hole in it which sends fuel back to the tank thru another line , This helps to eliminate vapor lock , Ed

[davids2toys]

No Tom,
Have not got near the car yet. It is buried in the garage at the moment.
Dealing with a bunch of Winter issues. my plow truck blew out the brakes the last snowstorm. Had to replace a bunch of parts. also need to fix the snowblower before putting it away, running like crap! numerous other things to take care of, then the cobra

[davids2toys]

Double post

[davids2toys]

Originally Posted by jts359

Have you taken the air cleaner off and moved the throttle to see if gas is spraying out of the accelerator pump jet ? On my Supercharged Studebaker there is a tee in the fuel line and fitting with a .047 hole in it which sends fuel back to the tank thru another line , This helps to eliminate vapor lock , Ed

Yes I have. Did you read all the pages in this thread?
Wouldn't that return hole cause a decrease in fuel pressure?

[Tom Wells]

David,

I understand winter problems...

That's why I'm in FL now ;-)

When spring arrives, see what happens - I'm still very curious - non-alcohol gas wasn't available when I fought that problem.

Tom

[twobjshelbys]

Non-alcohol gas locations can be found at www.pure-gas.org. They are pretty sparse, often at small airports or marinas. In Nevada it is only available 1-Apr -- 30-Sep.

[jts359]

Originally Posted by davids2toys

Yes I have. Did you read all the pages in this thread?
Wouldn't that return hole cause a decrease in fuel pressure?

Its only .042 and i found no issues with starvation , And if your using a Afb type of carb fuel pressure should be no more than 5lbs. And sorry i missed that part of your saga , good luck , Ed

[davids2toys]

Originally Posted by Tom Wells

David,

I understand winter problems...

That's why I'm in FL now ;-)

When spring arrives, see what happens - I'm still very curious - non-alcohol gas wasn't available when I fought that problem.

Tom

we will see, I do not think that is the problem though

[CHANMADD]

Hi, So after all this. Does the Carb have a pholic spacer under it?

[767Jockey]

The MSD box is prone to insidious issues that are difficult to impossible to detect even for MSD. I bought a second hand MSD box at a swap meet, hooked it up temporarily to the car to make sure it works, and I carry it as a spare. I've installed weatherpack plugs at the main and spare box so swapping it in and out is a very quick affair. I'd suggest that you do the same. Find a cheap second hand MSD box that you can confirm works and swap it in. You'll need a spare eventually anyway. If that cures your issue you know what the problem was. If not you have the spare that you'll eventually need anyway.

[davids2toys]

Originally Posted by CHANMADD

Hi, So after all this. Does the Carb have a pholic spacer under it?

No it does not, I have a turkey pan which protects the carb from the engine heat. I even put heat shield on the bottom of the turkey pan! It has been this way for years with no issues

[davids2toys]

Originally Posted by 767Jockey

The MSD box is prone to insidious issues that are difficult to impossible to detect even for MSD. I bought a second hand MSD box at a swap meet, hooked it up temporarily to the car to make sure it works, and I carry it as a spare. I've installed weatherpack plugs at the main and spare box so swapping it in and out is a very quick affair. I'd suggest that you do the same. Find a cheap second hand MSD box that you can confirm works and swap it in. You'll need a spare eventually anyway. If that cures your issue you know what the problem was. If not you have the spare that you'll eventually need anyway.

I hear you loud and clear. i actually bought a new one off eBay many years ago for a spare. I have never tested it and I would not even know how to do this except to put it in the car it self. My present MSD box tests perfect so that does not mean much. When I start working on it again I will run a few more tests that have been suggested and then maybe change out the box. that will not be easy because it is wired right in with no disconnects. It is also mounted upside down/ behind under the dashboard. I am older and have had many significant surgeries so my flexibility sucks. If I end up having to do this, I will definately use quick connections as you describe. i also may consider finding a more accessible place to mount it. Of coarse if it works, I will have to buy another one as a backup. Thank you

[kevins2]

I invested in a spare MSD box because I don't trust it. Mine is mounted under the glove box and I use a velcro strap to strap the spare to the main box when I want to test it. I can simply move the connection to the spare box and leave the main box in place.

[davids2toys]

That is an awesome idea, I love it! Just need to change all the connections to quick disconnect...Thanks
What type of connections would you recommend?