Mechanical fuel pump oil leak

Big lumps of metals and spanners. Including servicing and fluids.

Moderators: User administrators, Moderators

Post Reply
Lmh2000
Registered user
Posts: 21
Joined: 07 Feb 2026, 18:38
80-90 Mem No: 0

Mechanical fuel pump oil leak

Post by Lmh2000 »

Hi, as described I’ve narrowed down a small oil leak to the mechanical fuel pump. I’ve read pretty much all I can find about removing it & replacing the gaskets but as a newbie still have questions.

Is this something that can easily be done with the van on maintenance ramps or would I need more height as I can’t quite see where the top bolt is? If the Bakelite block is seized what’s the best approach to removing it? I was going to use brickwerks for gasket kit etc, trust this is recommended.

Anything else to look out for or any advice?
Depending on the ramp question how much might a VW classic workshop charge for this?

Thanks
1983 Holdsworth Villa 1
RHD 2.0 Air cooled

User avatar
jrt
Registered user
Posts: 3502
Joined: 01 Oct 2011, 15:53
80-90 Mem No: 10288
Location: East Cheshire

Re: Mechanical fuel pump oil leak

Post by jrt »

I’m not sure why you’d need a ramp to change the fuel pump? Just remove engine hatch and away you go. Which bits leaking?
David.
the future is unwritten

davidoft1
Trader
Posts: 3099
Joined: 27 May 2009, 18:56
80-90 Mem No: 16628
Location: hayling island

Re: Mechanical fuel pump oil leak

Post by davidoft1 »

Do you have an air cooled van ?

Lmh2000
Registered user
Posts: 21
Joined: 07 Feb 2026, 18:38
80-90 Mem No: 0

Re: Mechanical fuel pump oil leak

Post by Lmh2000 »

Yes 2.0 CU, the pump is attached to the crankcase
1983 Holdsworth Villa 1
RHD 2.0 Air cooled

Rosie n' Jim
Registered user
Posts: 240
Joined: 06 Sep 2020, 06:40
80-90 Mem No: 0

Re: Mechanical fuel pump oil leak

Post by Rosie n' Jim »

The top bolt is hidden behind the warm air feed to the air filter box. I have not yet found a way to get to it! You will need ramps, and patience. 
1982 Holdsworth poptop. 2L CU Aircooled.
1982 Danbury tintop Caravelle. 2L CU Aircooled.

User avatar
tobydog
Registered user
Posts: 1542
Joined: 07 Mar 2009, 21:03
80-90 Mem No: 6484
Location: Near Saarfend, Essex

Re: Mechanical fuel pump oil leak

Post by tobydog »

From memory, I dropped the engine...
Knowledge is power
1970 CU

User avatar
sarran1955
Registered user
Posts: 1517
Joined: 11 Mar 2009, 18:51
80-90 Mem No: 6754
Location: 6, les Hauts de Sarran 19800, Sarran ,Limousin ,FRANCE

Re: Mechanical fuel pump oil leak

Post by sarran1955 »

Hello,
If this will help, here is a video covering the oil pump and tinware on a CU engine:



From about 6 minutes...

Cordialement,

:ok

jnsp42
Posts: 1
Joined: 12 Apr 2024, 13:22
80-90 Mem No: 0

Re: Mechanical fuel pump oil leak

Post by jnsp42 »

Hi, I've just had my CU engine fuel pump off to check for a leaking diaphragm, it wasn't! Bit of a pain but doable with a jack and axle stands, easy access from wheel arch with wheel removed. There are two like torx bolts, that aren't, that hold the fuel pump on, more splines and found a suitable one in a draper bit kit. The top bolt on the tin ware is hard to find but again doable when removing, just a little fiddly. You will need two paper gaskets for the fuel pump and it's bakelite spacer, just remember to put it on the right way round, like I hadn't when I replaced the fuel lines! The trickiest bit is reinstalling the top bolt on the tin ware as it connects into a bracket under the engine hatch that holds part of the hose, back right of engine bay air box removed, this was loose on mine so a two man job to hold that in place while someone under the bus does the bolty thing. No need for engine removal.
Hope this helps.

Sent from my Pixel 10 Pro XL using Tapatalk


silverbullet
Trader
Posts: 17764
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Mechanical fuel pump oil leak

Post by silverbullet »

Torx not torx, probably 12 point star drive as per OEM cv joint bolts.
1985 Oettinger 3.2 wbx-6 Caravelle RHD syncro twin slider. SA Microbus bumpers, duplex winch system, ARC 7X15 alloys,
"Schrödinger's syncro"
Syncronaut #156

Post Reply