Perkins fuel delivery system

[coromandeljohn]

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

[rbk]

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 it’s specs are.

[Compass790]

Originally Posted by coromandeljohn

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?

[Minggat]

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.

[Lepke]

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.

[Sojourner]

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.

[Mithril Bham]

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