other Kugelfisher

[mobius74]

I have a 74 tii and I need to swap out the kugelfisher pump. I have one out there from a 72 and my question is will it work in my 74? Or does anyone have another option for me?

 

Thanks,

Rob

[John_in_VA]

While it might "work," I believe there are internal "tuning" differences with the '74.  I'd send it off for service.  There are a number of shops mentioned in these threads:

http://ww.bmw2002faq.com/forums/topic/182165-tii-pump-rebuild-step-1-of-xxxx/#comment-1120842

http://www.bmw2002faq.com/forums/topic/102875-kugelfischer-pump-injector-source-germany/#comment-253274

Edited September 13, 2016 by John_in_VA
provided links

[lilmo]

this ^

[bmdubl02]

I have not had any problems with my pump, and my tii has (I'm sure) well over 100K miles on her. 

I'm assuming that it would be a good idea for a pump rebuild soon? I've always wondered about this.

[bmdubl02]

Any advise on my query?

[Simeon]

54 minutes ago, bmdubl02 said:

Any advise on my query?

 

If your car is believed to be well maintained (oil regularly changed) and you have no particular reason to think the pump may be worn (car is performing well) then there should be no reason to speculatively rebuild it. 

[2002#3]

True dat, Simeon.  Of all the parts on a tii, the KF should not be fiddled with if it ain't broken and it's pumping fuel like it should.

Larry

[lilmo]

On September 13, 2016 at 6:20 PM, bmdubl02 said:

I have not had any problems with my pump, and my tii has (I'm sure) well over 100K miles on her. 

I'm assuming that it would be a good idea for a pump rebuild soon? I've always wondered about this.

Had mine rebuild at 325K.  Was seeping a bit of oil here & there.  Rebuilder said internals were fine.  Keep fuel & oil clean & you should be golden.  

[thehackmechanic]

I believe that you are correct that, technically, the '74 pump has a different part number reflecting a different cone.

 

However, if you search here, you'll find that the preponderance of opinion seems to be that, after 40 years, ethanol in fuel, etc, the pumps are generally considered to be interchangeable.

 

More to the point, I strongly agree with the above posters who advise to suspect the KFish pump itself LAST.  We'd need to know what the symptoms are leading you to think about having the pump rebuilt.

 

If you want to test something speculatively -- pull out the fuel injectors and have them tested for spray pattern and leakage.

 

--Rob

[kaptanoglu]

If you opt for a rebuild, PM me, as I have some opinions on your options.

[JohnH]

On 13/09/2016 at 7:31 PM, mobius74 said:

I have a 74 tii and I need to swap out the kugelfisher pump.,

Rob

 

Why do you think this?

 

As others have questioned, its probably the last thing to look at. Describe the problem you have.

[bmdubl02]

Thanks all for the input. Car and engine have been well maintained.

[mobius74]

Currently we have ran pressure tests on the main pump out of the gas tank and that is consistent. After that we tested the pressure coming out of the K pump and it will jump up and down leaving me with the car starving for gas. I tried running a tank of non ethanol gas and didn't solve or help my problem. I'm sure I need a rebuild or pump swap.    

[MatthewCervi]

38 minutes ago, mobius74 said:

Currently we have ran pressure tests on the main pump out of the gas tank and that is consistent. After that we tested the pressure coming out of the K pump and it will jump up and down leaving me with the car starving for gas. I tried running a tank of non ethanol gas and didn't solve or help my problem. I'm sure I need a rebuild or pump swap.    

What do you mean that you tested the pressure coming out of the Kugelfischer pump?  Fuel is no longer under pressure aft of the pressure valve at the back of the pump.  The correct place to measure pressure on the system is either inline before the Kugelfischer or at the hose leading to the cold-start injector.

 

If you don't have the correct pressure when it is measured correctly then you probably just have a bad or dirty pressure valve assuming fuel isn't leaking out of the Kugelfischer anywhere.

[lilmo]

2 hours ago, mobius74 said:

Currently we have ran pressure tests on the main pump out of the gas tank and that is consistent. After that we tested the pressure coming out of the K pump and it will jump up and down leaving me with the car starving for gas. I tried running a tank of non ethanol gas and didn't solve or help my problem. I'm sure I need a rebuild or pump swap.    

Check volume as well as pressure between the fuel filter and KFish.  What was the pressure produced by the electric fuel pump? Do you have the KFish tuning guide?