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  1. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    We replaced all spark-plugs last week with accell to eliminate those, we checked all the wires for arching, didnt see anything on the tester. The plug wires are also accell 8mm. No water or moisture in the cap or ignition that we could ever tell. THANK YOU again for all your help! We are...
  2. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    -Its a dual ballast resister -The ECU appears to be grounded well -The gap is set at .08 -The intake is a mopar dual plane for a 400 cubic inch motor -Carb is edelbrock 650 cfm AVS Thunder series -Heat risers are closed -Fuel line is a descent distance away from headers and exhaust, with...
  3. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    Thank you for all the info! Will get right back to you with all the answers to your questions. I really appreciate the help....
  4. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    We replaced it about 3 months ago thinking it was the problem but it didnt change anything. Will try another one though just in case. Thanks!
  5. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    It is not hard to start at all, it just runs rough - makes the tach jump then appears to have a miss. It only happens once the car has ran about 13 miles and warm. If you let it cool back down for several hours it will go another 10-13 miles then the same thing happens. We have a new...
  6. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    Push rod was replaced when we rebuilt the engine. Just checked to - - - Updated - - - It appears we are getting fuel in the carb - we did worked the throttle with the engine off and it is getting fuel. So here is our thought: could it be the distributor causing an electrical issue that just...
  7. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    [we pressure tested the fuel and we are getting 7-8 psi consistently. Thanks for the idea though. We do appreciate it. QUOTE=WP29440SE;910098389]how do you know its actually vapor lock and not weak fuel pressure or flooding? - - - Updated - - - It is fresh fuel and we are also using...
  8. K

    Vapor lock issues on a 1972 Roadrunner 400 engine

    Our 1972 Roadrunner is still having a vapor lock issue. We have shorty headers on it which is causing the extra heat buildup. We installed a riser on the carb, a metal fuel line that runs right beside the engine block that we put a heat protector wrap on. We run electric fans too. I am...
  9. K

    Gas tank venting issue 1972 Roadrunner

    I am going to check the four vent tubes on the gas tank and on the vapor separator. If they are not plugged up and I reconnect my four hoses from the tank to the separator can i take the rubber vent hose on top of the separator and run it to the rear of the car and cap it with a small fuel...
  10. K

    Gas tank venting issue 1972 Roadrunner

    We have a 72 Roadrunner we are having fuel venting issues. We noticed there are times the fuel filter get sucked dry, then the car runs rough, or dies, then the filter will start filling back up and we see bubbles. It is a clear filter that is between the fuel pump and the carb. The gas tank...
  11. K

    Quarter Panel replacement 72 Roadrunner

    We are restoring a 72 Roadrunner, after taking off ALL the paint the quarter panels have had way too much patch work done to them so we have decided to replace them. Does anyone know if there are "how to" video's out there that will help guide us in cutting the old ones off and then getting the...
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