924Board.org

[ThomasJoseph315]

What are these?
http://i1121.photobucket.com/albums/l504/zerocool9455/IMG_20130620_104232_zpsc2ac3389.jpg

Fuel Accumulator is on the left,..
http://www.oreillyauto.com/site/c/detail/BOS0/0438170015/02475.oap?year=1977&make=Porsche&model=924&vi=1263226&ck=Search_fuel+accumulator_1263226_3210&keyword=fuel+accumulator+

But what is that thing on the right?

[ThomasJoseph315]

If it helps I just found this...

http://www.ebay.com/itm/Bosch-0438170024/140963608100?rt=nc&_trksid=p2047675.m1851&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D261%26meid%3D8515437752830499775%26pid%3D100005%26prg%3D1088%26rk%3D2%26sd%3D130922835603%26

[Rasta Monsta]

Could it be that your car originally had the dual 20cc accumulator setup and someone added a single 40mm and plumbed around the other 20mm unit?
_________________
Toofah King Bad

• WeiBe (1987 924S 2.5t) - 931 S3

[ThomasJoseph315]

yea I dunno,.. I don't even know why this is even on this car if that's the case..

[ThomasJoseph315]

So am I supposed to have 2 of the smaller ones? How would this effect fuel flow?

[scm924s]

Not sure what year your car is, but the very first cars had one 20cc accumulator with an odd fuel pump mounted in the second recess where the larger accumulator sits. Porsche did a conversion kit very soon after launch to cure hot start problems, which added a second 20cc accumulator and relocated the pump onto the RH inner wing to aid cooling.

On the face of it, with the bracket you have there, yours should have the 2/20cc set up. After a short time(probably when the in tank pump came in), they replaced these with one 40cc on a different bracket.

Failure of the accumulator causes lots of hot start problems, they can rust out internally.
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

[ThomasJoseph315]

yea,.. I found that if you look up an accumulator for a 1980 924 you will find the larger 40cc accumulator, so that solves that mystery,..

The problem I am having with my car is it starts like crap. I have to crank it for like 30 seconds. Then when I get it going I have to pump the gas peddle to keep it going. Kinda like an old car with a carb with a broken auto choke. Then after it warms up to temp, it stays idling nicely, but it has severe acceleration issues. However,.. after like 4000 rpms and that second throttle body hole opens up it takes off like a rocket. At first I thought it was ignition problems, which definitely had issues there, but it didn't solve it totally. Before I replaced virtually every ignition piece there is, it wouldn't idle. Now it does but the hesitation is still there. I talked to a Porsche mechanic and he said since the pump leaks a bit there maybe air in the line. But, then there is this mystery 40cc accumulator suggesting that there are other issues. Soooo,.. I don't know... start at the fuel filter with a pressure tester and work my way back or forward?

what do I do? What is normal PSI for fuel pressure?

[ThomasJoseph315]

So I got into thinking about this,... I'm thinking giving what I know about this car with all the miss-matched parts that is on this thing what I bought it few weeks ago, this accumulator isn't supposed to be on there. The brilliant genius that put the wrong ignition rotor and fuel filter, also put in the wrong accumulator and changing the system to 60CC effectively reducing the fuel pressure due to the increase in volume. I'm betting what is happening is that the car cannot maintain pressure because of this, resulting in hesitation and bad starting.

Is there anyway to test these accumulators?

[scm924s]

There are probably a number of things that could possibly give you your problems. I would strongly advise carrying out a fuel pressure test as described in the Haynes Manual, plus any other fuel injection tests they recommend. I made up my own test kit from parts available at the time (in the UK).

Another possible problem is a sticky lift pin in the fuel distributor, if the car has been standing for long periods with old fuel.
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

[ThomasJoseph315]

I thought about the old fuel being an issue, so I put a can of sea foam in the tank. I think if there was sticking anything it would be more erratic with some sort of improvement or variation anyway.

If you or anyone could e-mail me a scanned copy of the fuel testing procedure in the Hayes manual, it would be much appreciated as mine is still on order.

What is the fuel pressure for this car? Mine is an early build (8/76) so I don't know if there are differences in the fuel pressure or not. I am fairly certain this is a single pump system.

[!tom]

http://www.924board.org/viewtopic.php?t=35734
_________________
78 924 NA
5-lug

[Ian89C4]

I have an extra Haynes if you want it. Pm me your address and I will send it your way. No charge.

_________________
Ian Edgerly
North Carolina

Current:
1981 924 SCCA/ChampCar Weissach Race Car ("Serenity")
1987 924S ChampCar Endurance Car ("Der Weg")
1980 924 Euro ("Wahala")

[ThomasJoseph315]

I would love it! PM sent! Thank you!

[ThomasJoseph315]

So I looked into this further,.. So I think I figured out what this previous owner gave up and had such a hard time getting this car to work. Aside from obvious issues with the ignition and vacuum leaks.. The car was so early in production it had mixed match parts from all over the VW-Audi-Porshe world so it's no wonder why he gave up.

So my guess is to whomever got these parts for this car simply didn't realize back in 76 they hand installed these things and practically used anything just laying around that would work.

[scm924s]