MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: ald1717 on February 16, 2022, 08:21:03 pm

Title: high pressure fuel pump reliability
Post by: ald1717 on February 16, 2022, 08:21:03 pm

are the high pressure fuel pumps solid and reliable or do they fail eventually just like the lpfp?

Title: Re: high pressure fuel pump reliability
Post by: colesey on February 17, 2022, 09:04:32 am

The rubber shaft seals are prone to perishing, causing fuel to leak into the engine oil. No separate parts available to repair, so you need to buy a new pump.

Title: Re: high pressure fuel pump reliability
Post by: ald1717 on February 17, 2022, 09:07:49 am

i think mine is okay then as i dont have petrol in my oil,

Title: Re: high pressure fuel pump reliability
Post by: breeze on February 17, 2022, 01:59:52 pm

A common failure is when the cam follower wears through. Then you can get the plunger for the HPFP touching the cam lobe. That is easy to check - either fuel actual vs specified values in VCDS or physically pulling it out and checking the pump plunger for wear.

Title: Re: high pressure fuel pump reliability
Post by: ald1717 on February 17, 2022, 06:10:47 pm

changed mine 15000 miles ago, was just curious if they can fail and how