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Old 14-11-2019, 17:51   #1
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Perkins fuel delivery system

Perkins 4.270 lift pump on its way out. There is an in-line electric pump already fitted. 1) Could I bypass the lift pump and straight into pre-injector pump filter?
2) Would that deliver too much fuel/pressure?
Thanks
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Old 14-11-2019, 18:28   #2
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Re: Perkins fuel delivery system

Why bypass it? Leave it plumbed in then you can easily bleed the system and it can act as a backup lift pump should yours ever fail. The pressure depends on the type of pump, check the serial/model/make and see what itís specs are.
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Old 14-11-2019, 18:41   #3
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Re: Perkins fuel delivery system

Quote:
Originally Posted by coromandeljohn View Post
Perkins 4.270 lift pump on its way out. There is an in-line electric pump already fitted. 1) Could I bypass the lift pump and straight into pre-injector pump filter?
2) Would that deliver too much fuel/pressure?
Thanks
1) yes
2) Unlikely as you would assume the fitted pump has a suitable pressure rating.

'why not reco the Perkins lift pump? Or are you just wanting to use the electric whilst recoing the Perkins pump?
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Old 14-11-2019, 19:34   #4
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Re: Perkins fuel delivery system

Depending on which way you go, if the diaphragm fails, you might end up with a crankcase way overfilled with diesel.
Don't ask how I know.
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Old 14-11-2019, 20:21   #5
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Re: Perkins fuel delivery system

If you know the lift pump is failing, why not disconnect it from the plumbing and leave it in place. If you're worried about backup, by a second electric pump. They're only about $20 on eBay.
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Old 14-11-2019, 21:48   #6
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Re: Perkins fuel delivery system

An electric lift pump is just another thing to fail on an otherwise quite nice and simple engine....ask me how I know. Ok, since you asked, mine burned a hole thru itself in the middle of a passage, belching many cubic meters of black smoke before I realized, shut it down, and it stopped. Replaced it with a simple hand operated bulb for priming, much simpler, pretty failsafe, and bleeds in a few pumps.
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Old 15-11-2019, 18:47   #7
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Re: Perkins fuel delivery system

Replace the lift pump. That way you will continue to have redundancy. Not that hard or expensive.
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