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Question on Small Block.. Weird Problem.. #1688684 10/21/14 06:17 PM 10/21/14 06:17 PM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	Car is a 70 Challenger with a 360 4V. Has new tank all new lines new filter new holley 600. You can crank it cold and it runs great until it warms up. Once it gets to operating temp it acts like it runs out of gas and shuts off. I can buy another fuel pump for it but I am wondering why it works fine cold and at temp it quits? Or is it something else? I am wondering what to look at next. I thought taking the non vented cap off would help but it doesn't. 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688685 10/21/14 06:24 PM 10/21/14 06:24 PM
Joined: Jan 2003 Posts: 29,650 Hamtramck, PA A Alaskan_TA Fluffy Balladeer
Alaskan_TA Fluffy Balladeer A Joined: Jan 2003 Posts: 29,650 Hamtramck, PA	Vapor lock? Do any of your fuel lines run close to the exhaust?

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688686 10/21/14 06:38 PM 10/21/14 06:38 PM
Joined: Dec 2005 Posts: 85 Illinois colt340 member
colt340 member Joined: Dec 2005 Posts: 85 Illinois	Does it have electronic ignition? If it does it could be a dead pickup. I had that problem on a big block and that's what it was. Took me about 2 weeks to find it. Quote: Car is a 70 Challenger with a 360 4V. Has new tank all new lines new filter new holley 600. You can crank it cold and it runs great until it warms up. Once it gets to operating temp it acts like it runs out of gas and shuts off. I can buy another fuel pump for it but I am wondering why it works fine cold and at temp it quits? Or is it something else? I am wondering what to look at next. I thought taking the non vented cap off would help but it doesn't.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688687 10/21/14 07:32 PM 10/21/14 07:32 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	I'd idle it in your driveway in drive with ebrake on (watch the temp) till it stalls & with a helper to crank it: IMMEDIATELY (1) see if the coil wire has spark and (2) if the AP still has a stream of gas. Holler back live every 24 hour block of time like it's your last day on earth

Re: Question on Small Block.. Weird Problem.. [Re: RapidRobert] #1688688 10/21/14 07:51 PM 10/21/14 07:51 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Sounds very much like a bad coil. I've seen it happen three times now where the coil would go open circuit when the engine hit operating temperature. Easy to do to swap a coil with a known working coil and see if it repeats. That's the easiest thing to do. R.

Re: Question on Small Block.. Weird Problem.. [Re: dogdays] #1688689 10/21/14 08:22 PM 10/21/14 08:22 PM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	I went out today and cranked it up. 79 degrees here. Let it sit in the driveway for about 3 minutes and started idling down until it shut off. Tried to crank it and it acted like it wanted to and nope it would not. I let it sit for about 30 minutes and it fired right back up and ran fine again.But I only ran it long enough to get it back in the shop. Here is a photo of the motor... 8307770-WP_20141021_003.jpg (74 downloads) 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

Re: Question on Small Block.. Weird Problem.. [Re: Alaskan_TA] #1688690 10/21/14 08:26 PM 10/21/14 08:26 PM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	Quote: Vapor lock? Do any of your fuel lines run close to the exhaust? Yes the fuel line on the passenger side is close to the t/a exhaust. I have wrapped it with heat wrap to see if that would help and no it didn't. 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688691 10/21/14 08:41 PM 10/21/14 08:41 PM
Joined: Jun 2005 Posts: 5,102 Western Md. skicker "The Champ"
skicker "The Champ" Joined: Jun 2005 Posts: 5,102 Western Md.	There was something posted a while back about mounting the coil and that some coils were not designed to be mounted certain ways. I see yours is standing up, I'm not positive but I'm thinking some were maybe designed to not be mounted laying down. Regardless I think I would repeat the cycle with starting it and letting it warm up till it shuts off. If it doesn't re-fire swap the coil out and try it asap. Its something small and stupid, your just going to have to swap parts out till you find it. Being that its a Holley double check the float levels to make sure its not dribbling fuel out of the squirters after idling for a period of time. ...FAFO...

Re: Question on Small Block.. Weird Problem.. [Re: skicker] #1688692 10/21/14 09:13 PM 10/21/14 09:13 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	When it stalls pop the gas cap and see if it's got vacuum. Use an IR gun to see what the coil temps are. Same with fuel line temps. http://www.harborfreight.com/infrared-thermometer-93984.html They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Question on Small Block.. Weird Problem.. [Re: Supercuda] #1688693 10/21/14 09:46 PM 10/21/14 09:46 PM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	I am running it without the gas cap on and it is doing it. How hot is to hot for the coil and fuel lines? I have a temp gun.. 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688694 10/22/14 12:57 AM 10/22/14 12:57 AM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Gas starts to boil around 180 degrees F. Less than that for both, much less if you can swing it. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Question on Small Block.. Weird Problem.. [Re: Supercuda] #1688695 10/22/14 10:07 AM 10/22/14 10:07 AM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	I am going to swap the coil out today for a new one. I know it is getting gas as after it sit for a 30 minutes it took just a a pump of the pedal to crank it back up. Fired right up.. So it did not run out of fuel from the pump and it has a 1/2 tank. 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688696 10/22/14 10:34 AM 10/22/14 10:34 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	that looks like an old accel coil..make sure it is for elect Ign systems not the points systems. I have a points style that would not work very good with a weak spark on the elect Ign sytems. stalled a lot, lots of spinning to start it..ect. worth checking the part # on it.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688697 10/22/14 10:52 AM 10/22/14 10:52 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Hopefully you don't have the filter between the gas tank and the mechanical fuel pump?

Re: Question on Small Block.. Weird Problem.. [Re: Challenger 1] #1688698 10/22/14 09:54 PM 10/22/14 09:54 PM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	Coil fixed it tonight. Ran for a long time and never shut off. And yes it was an accel coil.. A very old one.lol 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

Re: Question on Small Block.. Weird Problem.. [Re: Boosted] #1688699 10/23/14 10:15 AM 10/23/14 10:15 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	Quote: Coil fixed it tonight. Ran for a long time and never shut off. And yes it was an accel coil.. A very old one.lol gald it fixed it. was it a points coil? so now you got a antique coil for the

Re: Question on Small Block.. Weird Problem.. [Re: scratchnfotraction] #1688700 10/23/14 11:07 PM 10/23/14 11:07 PM
Joined: Feb 2008 Posts: 2,648 GA Boosted OP master
Boosted OP master Joined: Feb 2008 Posts: 2,648 GA	I have not looked it up yet.. I am going to get the car out and drive it some this weekend.. It is finally getting driving weather down here.. 2011 RAM3500 1967 Fastback Barracuda with some go fast goodies.

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