DDK - Die Deutschen Klassiker

jwhillracer wrote: ↑Thu Apr 18, 2024 5:09 pm Check the price from Porsche before you buy, several parts recently have been surprisingly competitive............

JW

Good advice. Thanks! Porsche price was £70 cheaper than I could find elsewhere so have gone for that...

To update - did the flow test and got 900 mil at 30 seconds which is in spec. That said I’m pretty sure I could have got in the car and it would have been fine to drive for a bit then the gremlin would return as it did yesterday…. Pressure still showing 9psi. I wonder if the 14 psi spec is measured ...

Will. Did you do the fuel delivery test.? Pump.? I would take a quick look at the fuel tank filter before buying a new pump. https://www.design911shop.com/p/fuel-filter-for-fuel-tank--6-mm-porsche-911-65-73/?currency=GBP&country=GB&gad_source=1&gclid=Cj0KCQjwiYOxBhC5ARIsAIvdH51KdT6bGXBZ...

RobFrost wrote:A new pump after 50 years is probably a good investment even if the old one still works. (Just trying to make you feel better about it)

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[emoji1787] thanks Rob. That’s what I’m telling myself too.


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jwhillracer wrote:Check the price from Porsche before you buy, several parts recently have been surprisingly competitive............

JW

[emoji106]


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If it helps to try, I ought to have a fully functioning MFI lift pump that you could borrow available in a couple of weeks' time. It is from our 2.4S and has been happily supplying the 3.2 short stroke MFI engine in our hillclimb car. At least it would confirm or rule out the pump. Cheers JW JW tha...

Bruce M wrote:Squirt a little brake cleaner into the air intake & see if that stops the hunting. The car will run on the brake cleaner when the fuel drops out, but if it’s a spark problem this will not act as a temporary fix.

Good shout - thanks.


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That hunting is weird .. so that was at part throttle ? All 6 cylinders effected which does point to something pre the MFI pump if fuel related Thanks James. Yes, part, half, full, makes no odds. Sent from my iPhone using Tapatalk You should hook up a timing light during hunting and confirm there's...

hot66 wrote:That hunting is weird .. so that was at part throttle ? All 6 cylinders effected which does point to something pre the MFI pump if fuel related

Thanks James. Yes, part, half, full, makes no odds.


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The hunting is probably because the pressure isn’t enough to open the injectors, until the pump builds enough pressure then they open & pressure drops until they shut, then repeat. Agreed. The question is therefore whether this is because of a dodgy pressure control valve or dodgy electric fuel...

Thanks Andy, from what I have read on Pelican it appears the consensus is that 11.8 PSI +/- 3 is spec so 8.8-14.8 is within spec so I would be at the bottom of that range but still should be ok. I haven’t checked flow yet so maybe that’s the best next step? Or maybe just bite the bullet and get a ne...

Update - let the engine cool for 30 mins then ran fine at about 10psi


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Hello again - to update: Got the pressure gauge and installed today. Ran pump and it was showing 12psi solid on first try and of course then she fired up without much trouble. See here: https://youtu.be/YlsVygWm-Xc?si=y9tDeSbuKtyiHGPY So after checking for any fuel leaks warmed it up and went round ...

RobFrost wrote: ↑Thu Apr 04, 2024 6:11 pm It'll probably run with this squirted in the intakes if it's a fuelling problem.

https://amzn.eu/d/inJdQQO

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thanks rob. have added to the list of checks!

Thank you! Will order.


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