Wha is this?

P

Parkinson

New Member

Posts

10

Location

Upper Marham, King's Lynn, Norfolk

• Jul 31, 2014

• #1

Hiya guy's, sorry for probably asking a stupid question but only recently started to look into the mechanical side of things on car's. Just been looking around on the 300TDI (Dorothy) and was wondering what this is...

Thanks in advance

Alex.

 

SteNova

Well-Known Member

Posts

2,200

Location

N. Wales, LL22

• Jul 31, 2014

• #2

lift pump

 

P

Parkinson

New Member

Posts

10

Location

Upper Marham, King's Lynn, Norfolk

• Jul 31, 2014

• #3

Cheers for the reply.

Any chance of explaining what it does? Sorry for being such a dimwit ha. :laugh:

 

SteNova

Well-Known Member

Posts

2,200

Location

N. Wales, LL22

• Jul 31, 2014

• #4

Lifts fuel

 

T

TheMunster

Active Member

Posts

360

• Aug 2, 2014

• #5

It's a fuel lift pump. It pulls fuel from the tank into the engine bay then to the fuel filter. The fuel injection pump is capable of pumping fuel from the tank on its own but it will lower performance and increase the amount of work it has to do. Thus the lift pump does the heavy work, then the injection pump can do the 'precise' bit

 

Last edited: Aug 2, 2014

D

deadmeat

New Member

Posts

7

• Aug 3, 2014

• #6

I read in one of the monthly mags that you can test if the lift pump is failing by:-
' undo doing the bleed screw on the fuel filter. If no fuel drains then the lift pump is failing as fuel is just been sucked through'
Is this correct ?

 

jamesmartin

Well-Known Member

Posts

91,879

Location

louth lincs

• Aug 3, 2014

• #7

no ,you can test pump works by pumping it and fuel flows but a poor seating valve that lets fuel run backwards overnight isnt so easy to see