One stack Posted September 3, 2014 Share Posted September 3, 2014 Have 300 in 1982 sits a lot. Starts but won't shut off and runs full throttle - glad it was in gear! Looking for help on what's stuck in pump. Shut-off and throttle move ok on pump. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/ Share on other sites More sharing options...
gearhead204 Posted September 3, 2014 Share Posted September 3, 2014 1 stack sounds like the rack is stuck, remove the rectangular plate that is near the top of the pump and just below the pump plungers its about 6x2 . you will see six barrels or plungers all geared to a common rail gently move each one in a attempt to find the stuck one when all is well then you move the throttle linkage the rail will travel from one end of the pump to the other and the barrels should twist. if you cannot free it. it will have to go to a pump shop or find a good used . sometimes some on e-bay. do not loosen the pinch bolt on the barrels as you can change the fuel delivery rate thus causing one cyl. to over or under fuel. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258427 Share on other sites More sharing options...
One stack Posted September 3, 2014 Author Share Posted September 3, 2014 thanks for the help. Here is picture of my pump,my side plate is larger than 6x2 just want to be sure am in right spot also is this just cover and nothing going to fall out. Probably silly ? But new to me am going slow. Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258459 Share on other sites More sharing options...
One stack Posted September 3, 2014 Author Share Posted September 3, 2014 Got it fixed had 3 stuck up took screwdriver and popped em down. Started it still ran wide open. Took apart had 2 stuck up did again started and idled. Thanks a bunch for the help 2 Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258485 Share on other sites More sharing options...
Maddog13407 Posted September 3, 2014 Share Posted September 3, 2014 spray some pb blaster in there and work them up and down a little. the tolerances are really close and with te garbage fuel we have today this is a common problem. Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258487 Share on other sites More sharing options...
One stack Posted September 3, 2014 Author Share Posted September 3, 2014 New filters and draining fuel tank-man that stuff is nasty! Thinking Fuel treatment for added lubrication might be good idea any recommendations ? Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258506 Share on other sites More sharing options...
farmer52 Posted September 3, 2014 Share Posted September 3, 2014 Yes I would recommend a 2X treat (clean-up) of a multifunctional (lubricity, detergent, etc.) fuel additive. 1 Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258508 Share on other sites More sharing options...
carlotpilot Posted September 4, 2014 Share Posted September 4, 2014 stanadyne 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258535 Share on other sites More sharing options...
gearhead204 Posted September 4, 2014 Share Posted September 4, 2014 glad you got her fixed just send payment to: ...............just kidding really glad it turned out ok! Quote Link to comment https://www.bigmacktrucks.com/topic/36937-pump-help/#findComment-258567 Share on other sites More sharing options...
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