Volkswagen Workshop Service and Repair Manuals > Golf Mk5 > Power unit | 4-cylinder injection engine (1.8 and 2.0 l engine, chain drive) | Fuel supply, gas operation | Activated charcoal filter system (Golf, Eos, Scirocco with engine codes CAWA, CAWB, BZB, CGYA, CCZA, CCZB, CDAA)

Checking fuel tank breather

Special tools and workshop equipment required

t	Hand vacuum pump -VAS 6213-

t	Pressure gauge -VAS 6550-

t	Connecting nipple -VAS 6550/3-1-

Test prerequisite:

l	Ignition must be switched off.

Test sequence:

–	Pull off bleeder line -1-.

–	Connect hand vacuum pump -VAS 6213- with connection nipple -VAS 6550/3-1- to breather line leading to activated charcoal filter.

–	Move slide ring -1- on hand vacuum pump -VAS 6213- to position -A- for „vacuum“.

–	Operate hand vacuum pump -VAS 6213- several times. Vacuum must not build up.

If vacuum builds up:

–	Check breather hole on activated charcoal filter → Item for soiling and clean if necessary.

If vacuum does not build up:

–	Seal breather hole -arrow- and operate vacuum pump again several times. Vacuum must build up.

If vacuum does not build up:

–	Also clamp off hose between activated charcoal filter and activated charcoal filter solenoid valve 1 -N80- → Item.

–	Operate vacuum pump several times.

If vacuum builds up: Renew activated charcoal filter solenoid valve 1 -N80-.

If vacuum does not build up again, renew activated charcoal filter.

Volkswagen Workshop Service and Repair Manuals