Fuel accumulator part number

4WDrifter · 06-10-22, 03:03 PM

Can someone tell me the part number for the fuel accumulators on a 1988 MB?
I can’t see it anywhere on audi.7zap.
Thanks.

K Simmonds · 06-10-22, 03:22 PM

I can't help with the part numbers...

However I do know one can use the unit from a MK1 Golf GTI for just about any Audi K-jet cars from the 80's and very early 90's. It's slightly longer than most of them but the fittings are the same, you may have to modify the strap that hold's the unit to the bracket/floor on some models. But it's a straight fit for my 1989 2.0 80 which is handy, I have one on the shelf of my workshop waiting to go on.

Though that might be handy if your stuck.

Also brand new ones are really stupidly expensive for what they are, so be ready for shock!

vagdream · 06-10-22, 06:29 PM

I believe the Audi part number is 447133441 and the Bosch number is 0438170052 but as stated above they retail for silly money. I picked up one recently as part of an Amazon offer but had to wait 6 weeks for delivery and am still waiting delivery for my Mk1 Golf GTi item- but they were way less than half retail price.

84CoupeGT · 06-10-22, 08:24 PM

I have read before that K-jet accumulators are interchangeable and there isn't much if any difference between them, this is only anecdotal on forums though and I don't have any personal experience to back that up! They are basically just a casing with a big spring and a diaphragm inside though, so if the fittings are the right size I can't see how you could go far wrong with a different part number... (Whether I'd try that given the prices is another matter!!)

Just out of interest, is it as part of a rebuild or have you confirmed the accumulator is defective?

4WDrifter · 08-10-22, 06:24 PM

My mechanic thought there might be a faulty one and I was trying to get one to swap in to see if it sorted problem

84CoupeGT · 08-10-22, 09:59 PM

What is the problem?

There should be a tiny grub screw on the accumulator, which is on the "dry" side, if you loosen the screw and any fuel comes out then the diaphragm is defective and the unit needs replacing. Any external fuel leakage that's not the fittings is also obviously a failed unit. You can also test for residual fuel pressure in the system with a pressure gauge after shut off at various points in the system, and narrow it down that way. Buying a new accumulator is an expensive way of testing it!

4WDrifter · 09-10-22, 11:55 AM

Quote:

Originally Posted by 84CoupeGT

What is the problem?

There should be a tiny grub screw on the accumulator, which is on the "dry" side, if you loosen the screw and any fuel comes out then the diaphragm is defective and the unit needs replacing. Any external fuel leakage that's not the fittings is also obviously a failed unit. You can also test for residual fuel pressure in the system with a pressure gauge after shut off at various points in the system, and narrow it down that way. Buying a new accumulator is an expensive way of testing it!

Thanks for this info we’ll get on to this during the week and I’ll keep you posted.

Gaz · 13-02-23, 10:14 PM

Quote:

Originally Posted by 4WDrifter

Can someone tell me the part number for the fuel accumulators on a 1988 MB?
I can’t see it anywhere on audi.7zap.
Thanks.

I deleted mine. I think it does hold pressure in the fuel system when engine is off, so could be the reason I now sometimes have a little trouble starting when the engine is hot.

4WDrifter · 15-02-23, 07:27 PM

Quote:

Originally Posted by Gaz

I deleted mine. I think it does hold pressure in the fuel system when engine is off, so could be the reason I now sometimes have a little trouble starting when the engine is hot.

Thanks for this.

06-10-22, 03:22 PM	#2
K Simmonds Senior Member Classic Audi Club Member Join Date: Dec 2009 Location: Mid Wales Posts: 1,060	I can't help with the part numbers... However I do know one can use the unit from a MK1 Golf GTI for just about any Audi K-jet cars from the 80's and very early 90's. It's slightly longer than most of them but the fittings are the same, you may have to modify the strap that hold's the unit to the bracket/floor on some models. But it's a straight fit for my 1989 2.0 80 which is handy, I have one on the shelf of my workshop waiting to go on. Though that might be handy if your stuck. Also brand new ones are really stupidly expensive for what they are, so be ready for shock! __________________ Still have my RS2 tuck up safe, also a 1992 C4 2.8 Avant quattro and a B3 quattro Saloon G60 conversion in progress. Last edited by K Simmonds; 06-10-22 at 03:24 PM.

06-10-22, 06:29 PM	#3
vagdream Grown up member Join Date: Jul 2015 Location: Llandudno Junction Posts: 165	I believe the Audi part number is 447133441 and the Bosch number is 0438170052 but as stated above they retail for silly money. I picked up one recently as part of an Amazon offer but had to wait 6 weeks for delivery and am still waiting delivery for my Mk1 Golf GTi item- but they were way less than half retail price.

06-10-22, 08:24 PM	#4
84CoupeGT Grown up member Join Date: Nov 2020 Posts: 309	I have read before that K-jet accumulators are interchangeable and there isn't much if any difference between them, this is only anecdotal on forums though and I don't have any personal experience to back that up! They are basically just a casing with a big spring and a diaphragm inside though, so if the fittings are the right size I can't see how you could go far wrong with a different part number... (Whether I'd try that given the prices is another matter!!) Just out of interest, is it as part of a rebuild or have you confirmed the accumulator is defective?

08-10-22, 06:24 PM	#5
4WDrifter Grown up member Classic Audi Club Member Join Date: Jun 2013 Location: Northern Ireland Posts: 209	My mechanic thought there might be a faulty one and I was trying to get one to swap in to see if it sorted problem

08-10-22, 09:59 PM	#6
84CoupeGT Grown up member Join Date: Nov 2020 Posts: 309	What is the problem? There should be a tiny grub screw on the accumulator, which is on the "dry" side, if you loosen the screw and any fuel comes out then the diaphragm is defective and the unit needs replacing. Any external fuel leakage that's not the fittings is also obviously a failed unit. You can also test for residual fuel pressure in the system with a pressure gauge after shut off at various points in the system, and narrow it down that way. Buying a new accumulator is an expensive way of testing it!