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Old 26-06-2014, 05:53   #16
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Re: Perkins 4.154 starts immediately, runs great, then knocks off once put into gear.

Whats your idle RPM?

It's normal to not show vacuum at very low fuel flow rates, reason is there is essentially no vacuum required to pull very little fuel through a clean filter.

a section of clear line after the lift pump as suggested earlier will rule out or prove the existence of an air leak, but if it starts again easily, I don't think it's sucking air
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Old 08-09-2015, 07:32   #17
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Re: Perkins 4.154 starts immediately, runs great, then knocks off once put into gear.

Thanks all for giving some time & thought to my problem. It turned out that the large inlet (banjo type) bolt on the injector pump had "failed." It's a sleeved fitting and it was junked up, I guess just due to old age.
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