Fuel Pump Leaking

[John S]

Alternative fuel pump

I too did not want to cut the original connector wires, so I made two jumper wires with eye connectors to fit the terminals on the new pump and spade connectors on the other end to plug into the to stock plug.

Good idea. I was thinking of doing the same thing with using spade terminals to connect into the stock plug. Much cleaner installation that way. Thanks,
John

 

[John S]

Orientation of newer style fuel pump

Hi Roger,
Did you install your updated fuel pump with the fuel inlet pipe facing the opposite direction from the original pump like is shown in this how-to link?

http://www.my2002tii.com/tii-fuel-pump_how-to.htm

Regards,
John

 

[RogerB]

Hi Roger,
Did you install your updated fuel pump with the fuel inlet pipe facing the opposite direction from the original pump like is shown in this how-to link?

http://www.my2002tii.com/tii-fuel-pump_how-to.htm

Regards,
John

John:

I installed mine with the outlet facing the front of the car whereas it exited from the side on the original pump and the inlet in the back as original. I can't recall, but it appears the tii pump is mounted as is the new one in the link 90 degrees differently from e9s?!?!?! In answer to your question: I installed the inlet in the same direction as the original pump. It just took a slightly longer hose to go from the front outlet of the new pump to the expansion tank as opposed to the side outlet on the original pump. Hope this helps. RB

 

[John S]

E9 mounting on body vs. 2002tii?

Thanks Roger,
You might be right that the pump mounting tabs on the body are oriented differently when comparing the 2002tii with the E9. I know that both cars share the same original pump and bracket. I have never removed the pump on my E9, only my tii. Will have to jack up both cars and compare this weekend. Thanks,
John

 

[BMW3.0CSi]

It is was tricky to adjust the impeller with its cylinders correctly. If wrong, the pumping action will range from little or no output to binding and the motor not turning. It's not just the rotational position of the piece within which the impeller/cylinders sit, but also the position of that piece in the x and y axes, if that makes sense. It needs to align correctly with the input and outputs. I tested it with water and it took me several tries. Then I removed the can to thoroughly blow dry the inside and also blew the impeller assembly but without disassembling it or you will throw off its position you just adjusted.

Hi Luis,

I took my CSi out for it's first trip in the new season yesterday, but after I started the car the fuel pump started leaking. I already quickly found this topic about it, and I already changed the O-ring of the can today as this was the issue. Despite this was the issue, I also opend the impeller assembly because I was not sure if it was the can or the impeller assembly ring.
But as you described you also have to carefully look for the way you install the impeller and cylinders. This part is not clear to me, do you maybe have more information about it or even pictures? Where do I exactly have to look at? Am I correct that the cilinders are all the same and that there is no difference in placing them upside down or the other way around?

Thanks, Rinke

 

[Luis A.]

Hi Luis,

Despite this was the issue, I also opend the impeller assembly because I was not sure if it was the can or the impeller assembly ring.
But as you described you also have to carefully look for the way you install the impeller and cylinders. This part is not clear to me, do you maybe have more information about it or even pictures? Where do I exactly have to look at? Am I correct that the cilinders are all the same and that there is no difference in placing them upside down or the other way around?

Thanks, Rinke

The cylinders are the same and they shouldn't have appreciable wear such that placing them upside down or such would matter. Let me try to explain. Look at the photo below. The circular ring that goes around the impeller can be moved a few mm's in every direction, left/right, up and down (relative to the photo) that's what I mean by the "X and Y direction". By moving that ring, the placement of the point where the impeller 'squeezes' the fuel can be anywhere around the impeller.

You want that 'squeeze' zone to be in the correct place under the cover. In addition, I seem to recall that if the screws are tightened all the way the cover will bind the impeller and prevent it from spinning.

Hopefully that makes sense. I can't explain it any better without holding the parts in my hands and describe it. I'm sure someone else here who's done it can explain it better.

 

[BMW3.0CSi]

I can't explain it any better without holding the parts in my hands and describe it. I'm sure someone else here who's done it can explain it better.

It's clear to me know and I also know where the confusion comes from. The ring around the impeller and the 'top cap' came of in one piece with my pump because of rust issues . Because of that it looked as one part. Because of the print of the rubber ring in the top cap it was clear for me how to mount it back. But because of this thread I was wondering what you ment with the x and y thing. Thanks for the clarification.