GavinBrigade Posted September 12, 2023 Share Posted September 12, 2023 I recently replaced electric fuel pump with original mechanical one that I had rebuilt for my 1955 Mack B85 Pumper. I can’t seem to get truck to fire after sitting and believe it to be a priming issue. Once she gets going no problem and will start again no problem after short intervals. There are no apparent air leaks. It is just a bear to get going from a cold start. Thoughts for corrective action? Much appreciated. Thanks, Pat Gavin 202-494-9108 cell Quote Link to comment Share on other sites More sharing options...
609albert Posted September 12, 2023 Share Posted September 12, 2023 when I had my mechanical fuel pump rebuilt same issue would not start ,we had to pressurize the fuel tank to start (tank was all the way in rear. It could be you have air in the fuel line etc. how about disconnect line from carb and crank over to see what it looks like . Quote Link to comment Share on other sites More sharing options...
doubleclutchinweasel Posted September 13, 2023 Share Posted September 13, 2023 From a totally ignorant perspective, it sounds like a check valve. But there are much brighter people on here who will be able to help. I have no doubt. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment Share on other sites More sharing options...
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