Freightrain Posted yesterday at 04:02 PM Share Posted yesterday at 04:02 PM Ok, seems my original pump is not keeping up. I can manually pump up 20# but after starting and running it drops to 10# and then barely holds 5# and then it has been just stalling out. I was perplexed with it not wanting to stay running after a few minutes until I put a pressure gauge at the filter and then I can see what is going on. Anyone have the proper part number? Thanks. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/ Share on other sites More sharing options...
fjh Posted yesterday at 04:24 PM Share Posted yesterday at 04:24 PM 24 minutes ago, Freightrain said: Ok, seems my original pump is not keeping up. I can manually pump up 20# but after starting and running it drops to 10# and then barely holds 5# and then it has been just stalling out. I was perplexed with it not wanting to stay running after a few minutes until I put a pressure gauge at the filter and then I can see what is going on. Anyone have the proper part number? Thanks. Bro before you go condemning the pump ! Have you checked the tank vent! Is the lines to and out of the filters clear! I have been burned by other people’s diagnostic conclusions before ! Check before you canon! just sayin! Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595751 Share on other sites More sharing options...
Freightrain Posted yesterday at 04:35 PM Author Share Posted yesterday at 04:35 PM Fuel system was no issue last fall. Now it suddenly won't run with new motor. I had lots of issues with getting this primed up when I first started it and it only had 2ft of hose to can of diesel. Then it really had problems drawing from tank. I replaced the new primer pump I bought with old bailing ring version from the 237 and it works much better. I can hear it returning fuel to the tank after pumping up 20# of pressure. After starting the pressure drops and won't recover. I know it should be 15# idling as that was what the 237 had. Too bad it is different pump or I would try it. New lines from lift to filter and back to injection pump. Remaining lines are good from before. New filter also. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595752 Share on other sites More sharing options...
fjh Posted yesterday at 04:56 PM Share Posted yesterday at 04:56 PM Ok just checking! You blew thru the lines new or not good to check! Trying to avoid any parts canyoning for no reason! Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595753 Share on other sites More sharing options...
terry Posted yesterday at 07:37 PM Share Posted yesterday at 07:37 PM Did you check the check valves and springs in the lift pump? terry Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595769 Share on other sites More sharing options...
Freightrain Posted 21 hours ago Author Share Posted 21 hours ago I pulled all four checks out of the pump. All clean and good shape. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595792 Share on other sites More sharing options...
fjh Posted 21 hours ago Share Posted 21 hours ago So if you’re going to buy a new pump be careful you get the right one ! Check the roller width there are two wide iWork on a narrow but not the other way around! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595794 Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago Wasnt there a post on here about the push rod being too long and was busting the pump ? Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595796 Share on other sites More sharing options...
fjh Posted 21 hours ago Share Posted 21 hours ago I would also check the spring in the return tee! The pump runs off the fuel pump cam directly Joe! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595797 Share on other sites More sharing options...
fjh Posted 21 hours ago Share Posted 21 hours ago There was also a tack drive variant! Doubt this is what he has! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595798 Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago Yes sir. I just remember a post showing broken flanges on the lift pump.. its been a while.. Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595799 Share on other sites More sharing options...
Freightrain Posted 21 hours ago Author Share Posted 21 hours ago Mine looks like this but I think mine has a much wider roller. Have to go out and look again. https://dieselpartscenter.com/products/supply-pump-genuine-pai-3599 I had to replace the pump on the 237 years ago due to low pressure and lacking power. I installed a pressure gauge and saw it drop out under boost. A new pump brought it right back. 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595800 Share on other sites More sharing options...
Joey Mack Posted 21 hours ago Share Posted 21 hours ago Ok, fjh.. i see the difference.. sorry.... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595801 Share on other sites More sharing options...
Freightrain Posted 19 hours ago Author Share Posted 19 hours ago Looks like only two variants are available. Single or double check valve. $166 isn't bad. Pretty sure I paid much more for the one in the 237 about 6-7 yrs ago. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595816 Share on other sites More sharing options...
mrsmackpaul Posted 19 hours ago Share Posted 19 hours ago My 2 cents worth Are you sure everything in this department (Tee circled in red) is working correctly? If it isn't building pressure here properly then it maybe just leaking back to the tank to quick Apart from that useless information, carry-on Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595817 Share on other sites More sharing options...
Freightrain Posted 19 hours ago Author Share Posted 19 hours ago I just went back out and pulled the pump. I unscrewed the line from the filter and it sprayed fuel, so I guess the check valve is working since it has been 4-5 hrs since I had it running. The other day I was out playing around and was going to bump the starter so I could get the trans into a gear, one quick hit of the starter and it lit off instantly. I typically don't leave the shut off pulled out. So my guess is the check valve is fine. Btw the roller looks narrow like the one in the ad I posted. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595818 Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago 14 hours ago, Freightrain said: Mine looks like this but I think mine has a much wider roller. Have to go out and look again. https://dieselpartscenter.com/products/supply-pump-genuine-pai-3599 I had to replace the pump on the 237 years ago due to low pressure and lacking power. I installed a pressure gauge and saw it drop out under boost. A new pump brought it right back. ! Thats the narrow so you need to make sure you use the one you have (wide!!!! ) not the one shown! in the pic! If the engine lights that quick you got a flow issue not a check issue! That Said ! I would be scrutinising all he hoses and all the fittings I have seen rocks and or debris stuck in elbows leave no stone unturned before the Canon comes out you got the time and likly a lot less money! Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595827 Share on other sites More sharing options...
Freightrain Posted 4 hours ago Author Share Posted 4 hours ago I pulled it back out, looks narrow Unless you have a part number, there appears to only be one available. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595835 Share on other sites More sharing options...
fjh Posted 57 minutes ago Share Posted 57 minutes ago Yep !Long as you’re narrow doesn’t matter which comes your covered you’re good if you’re going that route! Hopefully that cures your issues! Long as you’re positive you checked are the simple cheap and easy load the canon!😂 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595852 Share on other sites More sharing options...
fjh Posted 50 minutes ago Share Posted 50 minutes ago Save the old pump the new primer there is shit! Quote Link to comment https://www.bigmacktrucks.com/topic/76656-300-lift-pump/#findComment-595853 Share on other sites More sharing options...
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