K jet, not holding pressure after siwtchoff
Posted
#1536960
(In Topic #205257)
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My mk1 1.8 1983 GTIhas been suffering from hot start issues. Runs fine, leave it 15 mins or so when hot , wont start churns and churns, if it does start runs rough till it clears its throat. leave it an hour or more to cool and starts fine.Ran the pressure tests (thanks for the Kit mr Quiff)
All ok as far as I can tell, except pressure immediately plummets to 0 moment the ignition is turned off; as I understand it , it should hold a pressure for up to 20 minutesSo Ive had the fuel pressure regulator out, looks fine, green grommet looks fine , all clean moves freely.Next suspect is the accumulator, but I want to be right as its a £170 part from VW H. My reading suggests there are no specific tests for it, anyone know differentOther suspect is the non return valve . the one next in line to the pump (is that the only one?)
I recall having some issues with the valve which showed the exact same symptoms before when some prat (cant think who that was ), refitted it the wrong way round. has worked fine since correction ten years ago. I havent touched it sinceWhat can go wrong with return valve and, is that more likely to have failed assuming it can, (or do I face I have stump up and change the accumulator).before I make any expensive mistakes buying parts I dont need is there anything else I should look at that might cause this?
Cheers in advanceLewis
Posted
MOTY 2013
with the non-return valve its the thing screwed directly in the end of the pump that the fuel line attaches to. these can fail and are relatively cheap:
http://www.classic-vw.co.uk/fuel-pump-check-valve-for-gti-893906093-13453-p.asp
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
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Posted
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Thats really useful thanks,
will the fuel come out of the accumulator under any circumstances ie running recently run etc or doesnt matter?
Ill try that first before looking at the check valve this afternoon
had a nightmare yesterday when one of the pipes to the accumulator (return I think )sprung a leak, fuel hissing everywhere and tank empty in moments
Scary stuff, may well replace all pipes as a precaution even if not cheap
attending my own cremation isnt in my plan……
Would a small leak have a similar effect ( should have mentioned it earlier)?
Lewis
Posted
MOTY 2013
if that pipe on accumulator has been leaking for a while then it could well be the cause of all your problems, i woudl start by sorting out your lines then see where that gets you
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
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Posted
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it may have been leaking a bit before busting completely, ill try the screw trick anyway and see , would be easier to do the lot if it werent £170
The lines i think ill do anyway, the one in the engine bay tot he metering head has a few cracks, its all a bit scary
Had one go under the bonnet in the mk2 a few years, must be me...
Incidentally VWh do accumulators anywhere else do them if they dont have one in?
cheers
L
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
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Screw came out quite easily, no leak at all from the accumulator.
So plan to change all the hoses ( not a cheap exercise) as they're all looking a bit aged and see what happens after that
Will give me some peace of mind, Im still shaken by the force of the leak, you forget how much pressure the system maintains.
Thanks for all advice,
May be back on for advice on pipe changing next…….Lewis
Posted
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1986 GTI Cabriolet ("dambuster")
2000 Mk4 Cabriolet Avantgarde (bought for the mrs)
2001 Zafira 1.8
2000 Mk4 Cabriolet Avantgarde (bought for the mrs)
2001 Zafira 1.8
Posted
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I took initial guidance from this thread on CGTI http://www.clubgti.com/showthread.php?279048-Long-start-issue-solved!
and the pic of his regulator
Mine looked like this
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
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You'll need to sign into google/gmail for the link to work! (its free!)
Posted
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So how do you get that bit out then? I assume its pretty delicate
(thanks for all the advice btw , invaluable)
L
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
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,Ill have a dig around with a bent paperclip or something,
I thought Id just check there wasnt a more technical approach which Id failed to spot
Posted
Settled In
1986 GTI Cabriolet ("dambuster")
2000 Mk4 Cabriolet Avantgarde (bought for the mrs)
2001 Zafira 1.8
2000 Mk4 Cabriolet Avantgarde (bought for the mrs)
2001 Zafira 1.8
Posted
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Ok here it is difficult to photo with phone as its so small, couple of shots
the grommet is decidedly square edged and in line with piston rather than round and proud. so should it be replaced
and with what, I assume a rubber grommet is a rubber grommet, just need the right dimensions>
Posted
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3.68mm ID x 1.78mm CS for the tip and 6.78mm ID x 1.78mm CS at the other end - I used viton.
1986 GTI Cabriolet ("dambuster")
2000 Mk4 Cabriolet Avantgarde (bought for the mrs)
2001 Zafira 1.8
2000 Mk4 Cabriolet Avantgarde (bought for the mrs)
2001 Zafira 1.8
Posted
Settling In
whod have thunk it.
I found this kickin around the garage ( on the right from and RC car) , looks about the right size .
may pop that in while i find another to see if it does the job
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