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Hot starting issues with 1977 911 (fitted with 3 litre engine)

Keithf912

Keithf912

PCGB Member
Member
Hi,
I am sure a lot of people have had this (or have it) but thought I would list the works I have had done to see if anyone can point me to another culprit!
New fuel pump with working non return valve, new accumulator fitted, new injectors (as thought o rings could be perished). Starts very well when cold or starting straight after turning off. If I leave the car over 20 mins (heat soak?) it will not start.
The airflow meter arm does lift to start fuel flow through when I crank the engine. I can lift the arm to prime the injectors to start.
I did list this in the 2.7 section but have another question. The mechanic fitted a new accumulator by copying the one already there but I notice that my mates 3.0SC has a bigger accumulator (mine for the 2.7 is a about a third of the size), would this give me my problem?
Cheers
Keith
 
Hi Keith,
As a 911 Carrera 3.2 owner I have not got experience of an accumulator or airflow meter arm. What I have done is to have a quick search on previous Forum threads, apologies if you have already done this and covered off the points discussed in the links below.
I found a couple of examples of Hot Starting threads:
https://www.porscheclubgb.com/forum/tm.aspx?m=884878&high=hot+starting - and
https://www.porscheclubgb.com/forum/tm.aspx?m=555502&high=hot+starting
If you haven't located the Forum Search option is found by clicking on Forum in the Blue bar at the top of the page, you may find more help there.
Just a suggestion; another option may be to join the club to get access to the model Technical Advisors that provide assistance to the various model Registers.
To Join: https://www.porscheclubgb.com/membership
I hope the Forum links help. Good luck with getting your car sorted.
Steve
 
Thanks Steve, I will check out the links. I am a member but see it says guest of the Club, I wonder why? Best Keith
 
Hi Keith,
Sorry to hear you have the 'Guest of the Club' hitch, to remedy send an e-mail to: support@porscheclubgb.com
If you haven't got the starting problem sorted and need some help check out the Register Technical Support contacts in your copy of Porsche File.
Steve
 


Me again, I am going to change my non return valve at the fuel pump as I am not 100% sure that my original one is not playing up. I need one to fit a 10mm banjo as the new valve is for 12mm banjo. I know they are hard to find but someone may have one out there. Pelican Parts in the US are looking as well.
Old one on the left in the photo and new one on the right.

Looking forward to Silverstone Classic!
 
Hi,

Starting this enquiry again just in case any new information out there! Or can anyone recommend a good 911 guy near Buckinghamshire?

I am sure a lot of people have had this (or have it) but thought I would list the works I have had done to see if anyone can point me to another culprit!
New fuel pump with and a new non return valve (I fitted the valve today), new accumulator fitted, new injectors (as thought o rings could be perished). Starts very well when cold or starting straight after turning off. If I leave the car over 20 mins (heat soak?) it will not start.

The airflow meter arm does lift to start fuel flow through when I crank the engine. I can lift the arm to prime the injectors to start.
I did list this in the 2.7 section but have another question. The mechanic fitted a new accumulator by copying the one already there but I notice that my mates 3.0SC has a bigger accumulator (mine for the 2.7 is a about a third of the size), would this give me my problem?

Wondering if the smaller accumulator does not hold enough fuel volume for the 3.0 set up.

Cheers
Keith
 
Are you still having problems hot-starting?
If not, what was the solution?
If it is "heat soak" then perhaps the cooler weather will reduce the rate of fuel evaporation (if this is the cause?)
The larger accumulator is used on '81 and later SC and 930 Turbo engines, so it might overcome your problem.
 
Hi, yes all fixed there was a missing O ring in the fuel pressure regulator. Found out that inner ring is BS008 size and with one of them fitted it now holds pressure and starts instantly!
 
Hi Keith,
Thanks for the feedback, good to hear there was a "simple" fix, although finding the cause needed head-scratching, it seems!!
Philip
 
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