2.7 fuel issue 10 year hiatus

[coachkadis]

Hello
I have a 1976 2.7l 911s with the k-jetronic fuel injection. I have just begun to try and get it running again after it sitting for 8 years. New tank and fuel pump. When trying to start it i, it appears to be getting to much fuel, ala flooding. Can anyone tell me which component of the system I should be looking at first. I have tried youtube help but there are so many different views I am still not sure where to start. I am getting fuel to injectors and spark for sure. It does give a brief firing like it wants to start and then nothing. Pulling the plugs, they are wet with gas. Turning 70 in November and I would like to get this running sooner than later for my grandson. Thanks for looking and any help or ideas you can provide.
Coach

[al lkosmal]

Here is a good troubleshooting doc......
If the system is flooding at cold start....I'd check the fuel distributor plunger.....after sitting around, unused...they tend to get stuck.

[al lkosmal]

This one is a bit more legible.....

[coachkadis]

Thanks for your help. Can you tell me where the cold start injector valve line is supposed to run to? After taking pics on back of engine where I physicaly cannot see I noticed the cold start valve had no plug on it and there was no fuel line running to it. I am guessing I bought the car this way and it must have started fine without it but I would like to know where it was supposed to be hooked up to. I did look in the manual and there is no clear image of it nor do I see a broken fuel line hanging around the back of the engine hanging loose. My guess is that blocked off the fuel supply that runs to the valve. Image is below. Thanks again


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[boyt911sc]

Coach,

Your fuel line to the CSV is broken. I hope I am wrong but the blow-up (zoom) picture shows the banjo fitting has a broken fuel line. And fuel will be spewing all over the motor if the FP is energized.

You are very fortunate that the fuel pump is not generating fuel pressure. Stop now before you burn this car to ashes! I will give you a suggestion next time you want test run your motor. Do a fuel pressure test and watch out for any fuel leak/s around the system including premature fuel delivery to the fuel injectors.

Have a fire extinguisher handy. Good luck.

Tony

[Schulisco]

In case of little knowledge and because of the troubleshoot tables have been named I recon also to consult the K-Jetronic troubleshooting booklet, esp. :
https://cis911primer.com/Troubleshooting%20Guide/Notebook%20Spiral.html
(klick on the black squares or see the "next" link below, follow the path to get guidance through the behaviour of the engine to narrow your issues)

Don't let CIS gremlins confuse you either. This is basically the most common problem on working the CIS. Get familiar with any component of CIS as much as you can instead. The better you understand CIS and any component, the easier will be the troubleshoot.
I always recommend to watch the 911 2.7 CIS video series from KlassikATS: https://www.youtube.com/playlist?list=PLkWFofpgz2OgF9FdliKnlzuY0pygqRkMj This series contains several really worthful videos dealing CIS issues.

Literature:
https://cis911primer.com/home.html
and some other PDFs I posted several times here in the forum...

CIS looks more complex in the first glance, but it's basically more simple than you think in the beginning.

Make sure that
- the system is proven free from air and fuel leaks
- any electrical part works as designed
- any pressure related part works as designed
- everything else is in spec
- all pressures are in spec

I know - easier speaken than done, but that's IMO the only way not to go nuts with CIS

Sitting that long is always the worst case scenario for CIS you already know and therefore tank and pump replaced already. When flooding the engine on start several things can be the reason. First and foremost the WUR. But also a hanging/misadjusted sensor plate, a leaking/misbalanced fuel distributor, bad thermo valve and many more etc. The final boss are vacuum leaks and combined issues.

You urgently need those tools:
1. CIS pressure gauge
2. smoke machine
3. engine timing light
4. multimeter
5. a well filled toolbox
6. workshop tool mirror
7. magnetic lifter tool
8. lots of patience and perseverance
9. blood, sweat and (b/t)e(e/a)rs ...
10. fire extinguisher always in place and in the car for emergencies while test drives! You never believe, how quick such a car can burn down, as the engine and gearbox case are made of magnesium in this generation...

A final tip: Before starting the first test ride, let the fuel pump running at least half an hour with engine off to pressurize the whole system that long to see if all fuel lines are sealed!

Thomas

[coachkadis]

Thanks for the responses so far. I did find a major issue so far. The piston on my fuel distributor was frozen but I have managed to free it with gumout and it moves freely now. I will pit it back in later today and see what other issues may arise. I still would like to know where the fuel line originates to feed the cold start injector. The gas does not spew out when cranking or running so my guess is someone blocked the cold start feed years ago for whatever reason. I dont see a port on it on the fuel distributor so where else should I look. Thanks for all your help guys and I will read the info sent later today.
Coach

[eastbay]

Cold start line comes off main pressure inlet on the FD

[coachkadis]

Thanks for all your help. I found the culprit after seeing the picture sent by eastbay and then knew what I was looking for.

Looks like someone soldered one of the ports closed on the banjo feeding the fuel distributor. I ran the car unknowingly like this ten years without any starting problems.

Again thanks to all who responded.

[pmax]

So, evidently the car starts fine without the CSV. Always interesting to discover what was done back in the days....

Any service records ?

[eastbay]

Originally Posted by coachkadis

Thanks for all your help. I found the culprit after seeing the picture sent by eastbay and then knew what I was looking for.

Looks like someone soldered one of the ports closed on the banjo feeding the fuel distributor. I ran the car unknowingly like this ten years without any starting problems.

Again thanks to all who responded.

Good work, amazing to see what people do to cars to avoid buying parts.

[eastbay]

BTW, the poly line is available and simple to work with. Should be an easy repair