Re: Vapour Lock....

[Christian Els <tiAn@usiw.net>]

Vapor lock is nearly impossible in a fuel injected VW unless your fuel
pump is on its last legs. The 65-75 psi the pump (normally) exerts on
the fuel line will easily overcome any resistance to flow due to pent up
vapor. 

You may instead want to pressure test your fuel pump, test check valve
operation or pull an injector and make sure it is spraying fuel. If only
the cold start valve (5th injector) is pushing fuel into the engine, you
will get exactly the behavior you describe. 

Remember that VWs are CIS (continuous injection system) meaning that all
four (primary) injectors should spray all the time when the car is
running. If the pump tests OK, you may want to check the FI relay/fuses
or listen for the frequency valve to ensure the main injectors are
responding.

HTH

tiAn
87 16V
stuff



Sal Guzzo wrote:
> 
> Hi guys,
> 
> This is a scirocco related question:)
> Car: 81 Scirocco S
> motor: 8V
> 
> On my newly acquired Mk1, it has a hard timne starting.  In the morning, it
> will start, rev for a little and die.  Unless I keep my foot on the
> accelerator, it won't start.  Once it gets started, I gotta keep giving it
> gas to maintain an idle otherwise the idle dips down and off she goes.
> Once it gets warmed up, the idle will eventually creep its way to about
> 1600-1700rpms.
> 
> However, if I shut the car off and try to start it, I gotta keep the key
> turned for nearly 30 seconds before it catches again.  One of my friends
> told me that it's more than likely a vapour lock.  Is such the case and
> where do I start looking?
> 
> TIA
> 
> Sal
> 81 Scirocco
> 81 Scirocco S (with all the goodies)
> 84 Rabbit (now Gti)
> 84 Scirocco Wolfsburg
> 67 Peugeot 404
> 
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