TEST TEST TEST
It is best to purchase some tools to monitor fuel pressure
Before just throwing parts at your problem, unless price is no object. ;-)

So many items could cause your problem and it could cost you over $600 just
in parts with injectors, fuel distributor, fuel pump or it's check valve or
relay, fuel accumulator, plus whatever else I have forgotten about like
slightly leaking fuel lines.
I had to do this with a Scirocco saved from the junkyard and it needed
almost everything. Started up instantly at all times though.
--
JMHO
later,
dave
(One out of many daves)

"Erik Dillenkofer" > wrote in message
...
> Replace the fuel accumulator (near the fuel pump by the tank). The
> accumulator holds pressure in the system and prevents vapor lock.
>
> "SFC" > wrote in message
> . ..
>> Again a typical case of vapour lock. Fuel pressure drops off too quickly.
>> The fuel system should hold the pressure (about 14psi) for at least
>> 20..30min. Check for leaks and if it's a cis injection replace the
>> o-rings of the fuel pressure regulator located in the fuel distributor.
>>
>> SFC
>>
>> "JH" > schreef in bericht
>> oups.com...
>>> Regarding my recently aquired 84 VW Rabbit GTI - manual trans - 8
>>> valve.
>>>
>>> I have read posts regarding topics relating to hard, hot starts but
>>> have some additional questions.
>>>
>>> The car starts fine when it's completely cold, but takes quite a lot of
>>> cranking in order to get it to start when the engine is hot. I checked
>>> the cold start injector and found that it is working as it should on a
>>> cold start (sprays for about 8 seconds, then stops). However, the cold
>>> start injector does not operate at all on a hot start. The car does a
>>> "hot start" when I manually put 12 volts to the cold start injector for
>>> a few seconds while a helper starts the car.
>>>
>>> The other posts suggest that the failure is in the "hot start relay".
>>> I can not find a hot start relay on the car, or referenced as a part
>>> for this car. The only thing close is the CIS/Lambda relay. Is that
>>> it?
>>>
>>> I am about ready to add 12 volts directly to the cold start injector
>>> via a switch or, timer relay.
>>>
>>> Any suggestions?
>>>
>>> Thank you in advance!
>>>
>>> Jeff
>>>
>>
>>
>
>