88Mack300e6 Posted Thursday at 08:37 PM Share Posted Thursday at 08:37 PM 1988 Mack rd686 em6 300 with Ambac injection pump my supply pump keeps breaking at the top bolt (pictured below) injection pump just rebuilt, it’s the right supply pump on it, at a loss anyone ever seen this ? Quote Link to comment https://www.bigmacktrucks.com/topic/75233-fuel-supply-pump-breaking-off-injection-pump/ Share on other sites More sharing options...
The Heinz Posted Thursday at 09:38 PM Share Posted Thursday at 09:38 PM I hope someone can give you a good answer, but one of my customers with an '83 DM685S just had me order one for him from PAI, how funny that I see this post right after ordering one. Part number was ESP-3581 if anyone needed to know. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75233-fuel-supply-pump-breaking-off-injection-pump/#findComment-570512 Share on other sites More sharing options...
Joey Mack Posted Thursday at 09:38 PM Share Posted Thursday at 09:38 PM Is there a Push rod that may be too long, or the gasket is too thin ? Quote Link to comment https://www.bigmacktrucks.com/topic/75233-fuel-supply-pump-breaking-off-injection-pump/#findComment-570513 Share on other sites More sharing options...
70mackMB Posted Thursday at 09:46 PM Share Posted Thursday at 09:46 PM 1 hour ago, 88Mack300e6 said: my supply pump keeps breaking at the top bolt How many times has it broken off???? .....Hippy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75233-fuel-supply-pump-breaking-off-injection-pump/#findComment-570515 Share on other sites More sharing options...
fjh Posted Friday at 02:02 AM Share Posted Friday at 02:02 AM Good question ! Also an extra gasket may help! It may be bottoming the pump plunger! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75233-fuel-supply-pump-breaking-off-injection-pump/#findComment-570526 Share on other sites More sharing options...
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