[chittychittybangbang]

:+1

You are just masking the symptoms with the lift pump. Check the injection pump for oily stains. This can be a seal leak. Make sure the o-rings on the fuel filter are in place. There should be no-almost no bubbles in the fuel lines.

Almost any dealer will have fuel line in stock.

It's also possible that if you replaced the nozzles, that they weren't tightened properly and are leaking but I don't think it'll let much air in.

 

[chittychittybangbang]

First, don't drive the car until it's fixed because otherwise, as you said, fuel will dump out. If you turn on the ignition the lift pump will pressurize the lines and cause it to dump out of the missing cap.

Wash off the area with soap and water because diesel will eat the rubber lines.

The missing cap holds the fuel in. The part number is VW# 028 130 229 a. I don't know if your fuel lines are leaking or if they're wet from the missing cap but the fuel line part number is VW# 059 130 329.

 

[chittychittybangbang]

Yes, the cap and black coated flexible fuel line are the return line. Others have installed lift pumps and it seems to work fine. Make sure your lift pump isn't going past about 15 psi because gasoline electric fuel pumps typically work around 60 psi. This is way too much pressure to go to the fuel pump.

Also make sure the fuel filter return and feed lines are correct and not switched. Refer to the fuel filter change article for pics.

 

[chittychittybangbang]

I believe it's because injectors 1, 2, 4 are the same. To close it off with a screw would require more work than necessary when a rubber cap works fine. It would require #1 to be different. I would stick to the OEM cap and not put a screw there since you'll get metal shavings when you tap the screw into the hole.

 

[chittychittybangbang]

A small puff of smoke is normal. Maybe your nozzles are worn out? Most TDI have no problem starting but some smoke is normal. A large cloud is not. Do a compression test, maybe your compression is low?