MAQ's72 Posted January 24, 2018 Share Posted January 24, 2018 Hey Guys, I had to bring this up again as my Monte left me by the side of the road on a very busy US19 here in Fl. I had started a thread about replacing my mechanical pump back a few months ago but.... Never replaced the mechanical pump because it seems to do the job just hard starting after sitting for a week but after this last Issue I need to do something..... seems I experience some sort of vapor lock as it was a warm day last Sunday here in Fl.. (sorry guys up north) and I had not activated my electric fan I have in addition to the flex fan and had been sitting in heavy traffic for some time. She just started stumbling and hesitating a few minutes before and just stalled out at a red light and would not restart, cranked and cranked and nothing. First i tough it was loss of spark but tried the screwdriver test and got zapped... realized after getting some helped by an officer and a passer by to get her over to the side of the road that after it cooled for about 20 minutes before calling a tow truck I tried again; pumped and pumped the gas pedal and she stumbled an then started running rough but got smoother once I got rolling away from traffic. I fairly sure I got some sort of vapor lock as temp went up to 200 F after it stalled with no air circulation, it was at 180 while in traffic... not that hot I thought Got home let her sit for about an hour and started right up and ran fine, I do notice that once parked when hot and I go back to start her after 10/15 minutes it give me a very hard time to start. Anybody out there gone through this? I think rerouting my fuel lines and adding an electric pump might fix my problems, they only reason I had not is because Electric pumps are loud unless in tank. Looking foe some suggestions on a good electric pump will add a regulator also.... I am running an Edelbrock 750 Thanks, Quote Link to comment Share on other sites More sharing options...
Blackhawk Posted January 24, 2018 Share Posted January 24, 2018 Are you running a pump with a return line? Are any lines touching the engine or exhaust? Quote Link to comment Share on other sites More sharing options...
MAQ's72 Posted January 24, 2018 Author Share Posted January 24, 2018 The mechanical pump is vented back to the tank trough a narrow rubber fuel line like a 5/16' on the bottom of fuel pump..... , in 72 they seem to have a lot more evap systems as I have 3 lines in the center top of tank going out and one on either side of tank top comers left/right. This is a Buick 455 in the engine bay so fuel pump on drivers side fuel lines come in from below on passenger side then routed over water pump to fuel pump then back to carb. (I have a 350 being built to a 355 now at a local machine shop that is taking place of the Buick in the next few months) Quote Link to comment Share on other sites More sharing options...
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