Hi guys I have a 1980 mack I'm trying to get running correctly. It starts and runs but when it idles for about 5 min it stumbles and stalls out. When this happens It cranks long and finally starts. I thought it was sucking air so I replaced all the fuel lines as I thought it was sucking air. The fuel filters are new and have been filled I've primed all the way to the injection pump and this still happens. I'm a mechanic but not a diesel mechanic. I understand how the engines work but when It comes to drivability issues I'm laxed. I'd like to exhaust all possibilities before I shoot the lock off the wallet for an injection pump
1980 mack fuel issue
Discussion in 'Mack Forum' started by Cjkcustoms, Mar 8, 2022.
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When it dies, did you spin the fuel filter off to see if it has fuel at the filter?
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@Brettj3876 may have some ideas.
It’s a long shot, but take the fuel caps off and see if that helps. Vents may be clogged.Brettj3876 and Cjkcustoms Thank this. -
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It does it if the cap is on or off
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062 Thanks this.
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This gives any other ideas the pick up pump is after the primary filter and before the secondary. And it is a mechanical pump
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At least there's no electronics to worry about Lol
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