# Slow drip of diesel

**URL:** <https://community.cartalk.com/t/slow-drip-of-diesel/46740>\
**Category:** Maintenance/Repairs\
**Tags:** jetta, volkswagen\
**Created:** [March 28, 2010, 2:36am UTC](https://community.cartalk.com/t/slow-drip-of-diesel/46740 "2010-03-28T02:36:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![paulglad](https://avatars.discourse-cdn.com/v4/letter/p/b4bc9f/32.png) [@paulglad](https://community.cartalk.com/u/paulglad)\
**Post date:** [March 28, 2010, 2:36am UTC](https://community.cartalk.com/t/slow-drip-of-diesel/46740/1 "2010-03-28T02:36:47Z")

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We have a 2003 VW diesel jetta wagon with 63K miles. Always ran this on ~ 100% biodiesel. Recently (a month ago), the car began starting with difficulty; but, eventually starts. I see lots of air in the clear line near the filter - then lots of bubbles after the car starts. It runs fine. Just noticed a slow drip of biodiesel on the high-pressure side of the pump (~ every 20-30 secs) when the car is running.  
  
 Is there anything that can be done to repair this (short of a diesel pump overhaul)? Thanks in advance!

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [March 28, 2010, 10:32am UTC](https://community.cartalk.com/t/slow-drip-of-diesel/46740/2 "2010-03-28T10:32:21Z")

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Stop by [www.tdiclub.com](http://www.tdiclub.com) and there you will find the answer to any VW diesel question.

My guess is you have two problems. That slow leak and those bubbles, which also may be a leak indicator. A few small bubbles are OK on most TDIs but lots need to be addressed unless you want continued problems starting.

As I recall VW does not recommend over 20% bio on your engine, but I believe a lot of people due run more without problems.