fuel pump question


New member
Jan 12, 2021
volkswagen jetta
Im getting ready to pull the fuel injection pump off of my 2000 jetta, it is leaking at the top real bad. That being said I wanted to send it to someone to get that fixed and maybe tune it for better fuel mileage does anyone have any suggestions? Thanks in advance for any help or thoughts.


Top Post Dawg
Nov 10, 2013
Lawrenceville PA
2003 TDI Jetta Daughters Car, 2001 TDI Beetle, Daughters car, 2005 Golf TDI Mine, all 5 spds
DIFS, Diesel Fuel Injection Service (DFSI) in Oregon but I suppose that depends on if you’re in Manchester Vermont or Manchester UK.


Veteran Member
Aug 16, 2000
mpls,mn usa
14 jsw 6m, 96 B4v, miss my a4 :(
For some reason I'm having trouble finding the DIY right now but it should be in the mk4 forum. If I find it I'll link it here. It includes all of the info about kits, etc.

Here it is:

Replacing the top 2 seals is relatively easy, the kits are cheap, and you don't need to remove the pump. If you don't feel up to tackling it yourself, find a local guru to do it.

BE SURE to scribe/mark and thoroughly clean the pump before opening it up so you can align things for initial start afterwards. Whoever does it will need vagCom/vcds to setup IQ afterwards.

I don't know of any changes that can be made to the pump to increase MPG unless the pump has some problems currently. You can tweak IQ, which might give a bump in MPG at the expense of performance (both slight changes).
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