Diesel Pumps 1 Or 2

[VWELSH]

Hi all

 

I own a mark 1 Sharan Tdi on a R plate which is running rough, my mechanic said the pump is not pulling enough fuel, he filled up the diesel filter and it ran fine, but gradually became rough as the fuel drained from the filter.

 

i just want to ask if these cars have a low pressure pump and a high pressure pump. And if anyone else has had a similar problem.

 

And could this problem be caused by clogged fuel lines.

 

many thanks

[seatkid]

On the mk1 tdi's there is only the mechanical pump that is integral to the distributor injection pump. Not sure what the mechanic was trying to prove as the feed to the fuel filter is from the top of the filter.

 

Change the filter for a new one and check the T-piece in the top has an O ring (some have two) fitted as this can get lost. Its a good idea to change the O ring(s) for a new one as often air will leak in here.

 

Clogged fuel lines of course cause problems, has someone put something maliciously in your tank? It would be almost impossible for any other normal reason to clog lines.

 

Contaminents could be present.

 

1. Water - usually only a problem with cars that have stood a long time.

 

2. Petrol! Have someone topped up with the wrong fuel?

 

In these cases drain the tank

 

3. "Bio fuel" - I'm talking about the guys who try to run their cars on old chip fat or supermarket cooking oil. If not chemically processed correctly and filtered (which is most likely) then fatty deposits etc will clog everything up (as well as damage the pump etc). More radical cleaning methods would be needed here, possibly involving strong cleaning additives (thinking of things like the Forte products), often the damage done though is terminal.

.

[VWELSH]

Thanks for info.

[VWELSH]

Have had the error codes read now and shows 01268 fuel quantity adjuster.

I have done a bit of research and understand this can be checked and corrected using a VAG COM cable

and VDCS lite. Is this correct and can anyone recommend where i can buy a cheap but decent VAG COM.

 

Many thanks

[Saif Rehman]

Have had the error codes read now and shows 01268 fuel quantity adjuster.

I have done a bit of research and understand this can be checked and corrected using a VAG COM cable

and VDCS lite. Is this correct and can anyone recommend where i can buy a cheap but decent VAG COM.

 

Many thanks

 

eBay is your best bet. Just type in 'VAG COM Cable' in the search box and all will be revealed.

 

for example, try this by GSF car parts: http://www.ebay.co.uk/itm/280905235590?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

[VWELSH]

Cheers will give it a try.