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Zero fuel pressure when running??

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Hi guys and gals!

I need a little advise from any K jet gurus out there please….

I've had my 83 GTI tin top for a little while now, in that time I've been working through all the usual issues with success! the car  has always driven really strongly, although  it had rubbish cold start!

So a couple of weeks ago i started to investigate what the problem might me? I've tested the time out switch! OK! I've tested the 5th injector! OK! I've tested AAV! Faulty! so replaced with a good unit I bench tested before fitting! I have stripped and cleaned the WUR and rebuilt it with a new rebuild kit off eBay!

Now the car starts first flick of the key!!! But sadly is undrivable:banghead::banghead:So this morning I hooked up a fuel pressure tester and I can not get my head around the readings???? Start the car and the gauge reads zero fuel pressure??
Close the tap (even only half way) to check the system pressure and she stalls? instantly!!I

With the engine off is the only time the fuel pressure gauge registers any pressure @ 40 psi which holds strongly which I know is telling me the the accumulator is working fine.

Now seeing the only part I've messed with on the fuel side is the WUR I've had it apart again and all looks good???
I Don't know if the WUR rebuild kit had any faulty parts???

Any sound advise would be great as this is the last hurdle and I really want to get out and enjoy my GTI.

Many thanks  Mark. IMG_5690.JPG

 

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You probably need to set the control pressure on your WUR. Have a google as there is plenty of info around.
Here's a starter for 10 - 928 Classics - CIS Warm-up Regulator (WUR) - YouTube

My rebuild thread I will try and keep up to date: here

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paceman said

You probably need to set the control pressure on your WUR. Have a google as there is plenty of info around.
Here's a starter for 10 - 928 Classics - CIS Warm-up Regulator (WUR) - YouTube


Thank you very much paceman! Your a star :thumbs:

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All sorted now drives great!!!! Thanks again paceman:thumbs:

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Wow, not sure I've ever remotely correctly diagnosed a problem before!

You're most welcome!

J

My rebuild thread I will try and keep up to date: here

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Raider said

All sorted now drives great!!!! Thanks again paceman:thumbs:
How did you solve the problem or what was wrong as it may help someone else if they look at this thread?

1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 300,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.

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paceman said

Wow, not sure I've ever remotely correctly diagnosed a problem before!

You're most welcome!

J

Even a Broken Clock is correct twice a day.  Good job.

What do Divorces, Great Coffee, and Car Electrics all have in common?

They all start with GOOD Grounds.

Where are my DIY Links?

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Briano1234 said

paceman said

Wow, not sure I've ever remotely correctly diagnosed a problem before!

You're most welcome!

J

Even a Broken Clock is correct twice a day.  Good job.

Touché Brian!

My rebuild thread I will try and keep up to date: here

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mark1gls said

Raider said

All sorted now drives great!!!! Thanks again paceman:thumbs:
How did you solve the problem or what was wrong as it may help someone else if they look at this thread?

After being pointed in the right direction by paceman it was quite easy!

leaving the pressure testing kit on the car I removed and stripped the WUR again!!! lol

I then drifted the post that the bi metallic strip attaches to, up until it was almost flush with the WUR casing!
Then I rebuilt the WUR again and reattached the fuel lines but left the power supply disconnected and left the WUR off the engine!
Whilst the WUR was resting on the front panel on a bit of timber!

I then started the car and the stone cold control pressure shot up to 3.7 bar, I got one of the lads to steady it and using the right sized drift I tapped the post back down very carefully until I had 31psi (2.1bar)
I then plugged the power supply back into the WUR to start heating the bi metallic strip.

after several mins (the fan kicking in and out a couple times the fuel pressure settled at 51psi (3.5bar)

I then checked the system pressure and had 73psi (5bar)
With the the engine off it held 40psi for over 20 mins
set the O2 and happy days……….

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Good job, love folks that post the resolutions.

What do Divorces, Great Coffee, and Car Electrics all have in common?

They all start with GOOD Grounds.

Where are my DIY Links?

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 :thumbs:

1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 300,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
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