is there any way to fix 1974
 

leaky fuel accumulator leaks on bottom right by the little screw
thx in advance

Some images will help.

Best,
Grady

or get a new one prior to the fire.

why then i could sell it for parts here and probably make more than the car is worth

if you need an image then you probably cant help me because it never happened to you then its a stock accumulator that has a little screw on bottom and its leaking drops thru there
thx

The right way - replace the fuel accumulator...

The cheap way - take out the fuel accumulator and a seal up around where its leaking with a gasoline safe sealant. Gas is a great solvent... so I have not idea what you should use.

Personally I'd go with option 1. In either case, be ready for a fair amount of fuel to come out of the lines. I just did my fuel pump, accumulator, and filter, and there's an decent amount of fuel that stays in the system. Having a disposable container (water or soda bottle) to collect the fuel from the lines will help keep the mess down.

Also, while you are in there, change out the fuel filter.

If it is a stock accumulator (Bosch 0438170015) then there is no "little screw" - at least not on my 30K 2/74 car. Of course it may be different on the "930 slant nose" variant.....:rolleyes: Give us some details and we'll be glad to help you. -John

Mine also recently developed a leak in the same location. I removed the small screw, cleaned up the threads and replaced the screw with a little 3M liquid pipe thread sealant. I made sure the screw was well tightened. The leak has been fixed.

I also have a pressure accumulator from an 81SC which has a hose connection at the bottom (in place of the small screw) which connects th the fuel return line to the fuel tank. I understand that this is to drain any fuel that escapes past the diaphram/spring? in the base of the accumulator.

I guess there is a possibility that the diaphram in your (and my) '74 accumulator may have developed a leak past the diaphram into the base area.

I am going to remove mine, remove the small screw, seal the normal outlet and pressurize the inlet and see if pressure is escaping past the diaphram. If so it will be time to replace.

Good Luck - Steve

930slantnose

this is why images might help!

ed

"Use the search function.....%^)"

Paraphrased...

paulgtr

just me

Join Date: Dec 2004
Location: NY NY
Posts: 632

steve you seem to know what im talking about when you took out the screw was there any rust or just gas.and when you put back did you put back the same screw
thx mike

this is in a 1974 911 just like the ad reads and the part number is 0438170015 and yes it does have a little screw look up on google and you will see it
thx i think ill just clean it with a little air and carb cleaner and take steves advice
thxfor all your help

long horn why would you change all those things was your car having trouble starting or something

Fuel pump was definitely bad... bypassing the relay would only cause it to intermittently work, so that had to go.

Fuel accumulator was old, and easy to deal with at the same time.

Fuel filter because its supposed to be done every 6k miles, its cheap, and I was in there.

heres the image 1973 1974 1975 1976<a href="http://tinypic.com?ref=28rgu3r" target="_blank"><img src="http://i51.tinypic.com/28rgu3r.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

oh ok was it hard starting

Actually part number is 477-209-083-M14

usually if it leaks you are also having a problem with warm/hot start.

it's a $117 part - you can probably thank ethanol for the break down in the diaphram.

Carry a fire extinguisher, I would not transport anybody you really care about. Where the accumulator is - makes it easy for gas to pool - then drip on the heat exchangers - then the excitement can start.

Um, do you have any idea who Grady Clay is and what he knows about our cars? As the old cliche goes, he has no doubt forgotten more about these cars than many of us will ever know.

You might consider apologizing for dissing him in a very public forum, to which he contributes regularly and with great skill.

Hi Mike. Yes I put the same screw back again. The screw was rusty but cleaned up OK. I screwed it up as tight as I could with the sealant and it has been leak free for a few months. As indicated before this may be indicating a further problem and as others have recommended, replacement might be cheap insurance. - Steve

any fuel behind that screw is from a leaking diaphram in the acumulator. Later models had a hose from the screw back to the return line going to the tank. You need a new one, it will eventually tear all the way and it will be hard to start a warm engine, as the accumulator is what keeps your residual pressure there for next start up. get a new one or get some insurance. sealing the screw hole with sealant is not the way to fix it. who is Grady Clay?

Leaking Fuel Accumulator.........
 

These are the two (2) most common FA (fuel accumulators) you'll find in 911 CIS engines.

http://forums.pelicanparts.com/uploa...1286826377.jpg

These are almost interchangeable in application. The major difference between the two (2) is the bottom port for the drain line used in later 911 CIS engines. The presence of fuel at the bottom chamber for earlier FA (with no drain-line) is an indication of ruptured or broken diaphragm. However, this is not completely true for the FA with drain-line. Its bottom chamber does have fuel during operation. A simple pressure test will show whether the diaphragm is broken or not.

Your FA is bad and has to be replaced to prevent accidental fire. The engine would still start OK if you allow enough time for the FP to build the fuel pressure because in your case, the FP does run as soon as you turn the ignition to ON/RUN position. FP's for CIS engines with FP relay don't run when ignition switch is @ on/RUN position.

Tony

You made coffee come out my nose. Only a "Well bless your heart" would have been more subtle....

+1

Bless my azz, this guy is a jerk!!!

It's NY thing......when I first hurt my back, I went off on a guy that was snotty to me on a simple question.....got a 2 week time out for it.

Hey....there's NY (state)...and there's NY ( city)......don't lump us all together as from the same place with the stereotype, cocaine-driven hyper intensive, insensitive responses... :) !!!!

Yes it's a NY CITY, slant nose cab. driver, ugh...

what are all you people talking about

i didn't disrespect anyone all i said if he needed a picture then he probably never ran into this problem because there is only one accumulator with screw on bottom for a 1974 911 .

Yeah, shoulda said NY, NY....my bad....

boyt the cars first start only if i hold my foot on gas pedal then no problem starting again all day i wonder if this has something to do with it only first cold start
thx

hey james why am i a jerk

Well, the jerk comment was because you bluntly blew off one of the forum's 'graybeards' who as others have mentioned knows as much about these cars as the Germans who designed them... possibly more.

As to your cold start problems, there are a number of potentials.
- 1: fuel accumulator isn't holding pressure overnight... if its leaking this is certainly contributing.
- 2: cold start valve isn't firing, or isn't firing properly.
- 3: The '74 doesn't have the AAR (or AAV, I get them confused), and instead has a hand throttle to provide extra air during startup. Are you following the correct cold start procedures? I don't know them, but I do know its more complicated then "Insert key, turn key" Hopefully somebody with 2.7 will post the startup procedures.

Also, if you are starting the car with the throttle floored, I hope you have a Pop-of-valve installed in your airbox. If not you are risking a backfire cracking the airbox. Those run around $500 unless you find a used one... plus the time to replace it.

Fix the accumulator first, because you know its a problem. Once that's fixed, if the problem persists check your CSV for operation. A quick forum search should yield some testing procedures.

Sorry, not a jerk, just a NY NY person, my bad, I apologies. Oh and BTW I like the color of that hot rod, what is it?
Don't take it personally, there are all kinds of people on here, the wine and cheese crowd from California, the tree huggers from Oregon, the deep south Miami sunglass crowd, not many Jersey types, and the great ones from the PNW. So as you see, we are many,divers, different, but Very knowledgeable in Porsche's. So ask your questions and be prepared to learn something.

its white pearl thx i forgot its probably if i remember infinity white pearl believe me i was not offended i just wanted to know why anyway theres not a problem on my end no need to apologize

just touching the throttle barely like 1300 rpms im not nuts altogether

longhornchris04 has already addressed part of the start up procedure in his post but there is something you should know as well regarding the 74. The hand throttle is to be used on cold start for two reasons: one, it provides a measured amount of throttle (it actually pulls on the throttle cable) for cold start running and, two, it activates the micro-switch on the throttle body which allows the cold start injector to shoot fuel into the intake. Using your foot to push on the gas pedal will accomplish the same thing but you do risk a huge backfire as mentioned. The manual for these early CIS clearly state that you should not push fully down on the gas pedal.

It's quite possible the cam in the tunnel that activates the hand throttle/cable has broken and that's why you don't use the throttle--not an uncommon failure in the old cars. If your current starting procedure results in immediate firing (once system pressure is maintained--you do have a leaking accumulator), then your cold start injector is working properly. Your car does not have any of the "automated" warm up features of later CIS (aar, aav for example) so you are in control of the process from the get-go.

Thanks for that L.J. - Learned something new today. I also have a 1974. I was also wondering why the hand throttle worked better with cold start than just holding or pumping the gas pedal. Now I know.

lj where is the hand throttle usually
thx mike

oh thats what the lever is for between the seats i never started with that will ttry after put new accumulator in.
thx