Jocko Posted July 5, 2012 Share Posted July 5, 2012 hey guys on my autocar whenever you hit the fuel pedal it has a slow reaction time to get up and it takes a while for the throttle to come back down. im not really sure what i could do to fix this. it has a cummins pt fuel pump. Quote Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/ Share on other sites More sharing options...
Frmconcrete09 Posted July 6, 2012 Share Posted July 6, 2012 We had a freight shaker doing similar to what your talking about .. I then spotted a leak on the pump out of what I guess was a vent. Anyway we took the pump off and had it rebuilt and it cured all 3 problems , not sure if yours is the same . Ours was a big cam cummins 1 Quote Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/#findComment-127076 Share on other sites More sharing options...
Jocko Posted July 6, 2012 Author Share Posted July 6, 2012 thanks i'll check that tommorow but i dont think thats the problem the pump is dry and no fuel leaks are visible Quote Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/#findComment-127139 Share on other sites More sharing options...
macattack Posted July 6, 2012 Share Posted July 6, 2012 i think its time for a rebuild. mine did the same thing until the rebuild. easy to remove. Quote Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/#findComment-127145 Share on other sites More sharing options...
bullhusk Posted July 17, 2012 Share Posted July 17, 2012 hey guys on my autocar whenever you hit the fuel pedal it has a slow reaction time to get up and it takes a while for the throttle to come back down. im not really sure what i could do to fix this. it has a cummins pt fuel pump.I think It's time for the pump to come off an get rebuilt, water is a big problem for those PT pumps, I would put a water sep. filter on the A-Car, a lot of those only had one fuel filter on themBULLHUSK Quote Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/#findComment-129245 Share on other sites More sharing options...
theakerstwo Posted July 18, 2012 Share Posted July 18, 2012 May be sucking air but its easy to check. If you dont have a sight glass then make one. If the supply hose to the pump is a # 10 straflex then get two swivels andremove the thimble that screws on to the hose and dischard them. Go to the lumber yard or hardware store and buy some clear hose that will go over the fittings and then put a clamp over the hose. Put it inline at different places to look for air bubbles in the fuel when running half throdle.If you can find it then pull the tackometer cable off of the fitting its screwed on the pump.With the engine running maybe 1500 pour some fuel into the opening were the tack cable was and then watch for it to be sucked in side.Also put a little bit of luber plate or white lub in the weep hole of the front drive cover of the pump.Watch for it to be sucked in side. This can be done with engine running and bend the clear plastic hose over and pull a restriction on the hose from the pump.This will make it suck in faster.If you find the problem then post back with the details and maybe it can be repaired on the truck. glenn Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/#findComment-129387 Share on other sites More sharing options...
raydurr Posted August 4, 2012 Share Posted August 4, 2012 Ill bet anything she sucking air. Quote Link to comment https://www.bigmacktrucks.com/topic/26046-problem-on-cummins/#findComment-132134 Share on other sites More sharing options...
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