New Pierburg Fuel Pump Fouls Linkage
- Thread starter TedS
- Start date
Looks like you have the one with a short neck? the long neck version, looks identical.
What about the insulator, present, absent?
Does yours have a short cylindrical neck?
BMW E3 E9 (1968-1974) Fuel Pump (8 mm Inlet / Outlet Fitting) PIERBURG +WARRANTY | eBay
BMW E3 E9 Fuel Pump PIERBURG OEM +1 YEAR WARRANTY. Made by PIERBURG OEM. NOTE: 8 mm Inlet Fitting, 8 mm Outlet Fitting. 1971 - 1974. BMW # 13 31 1 260 677. 1972 - 1974. 1968 - 1971. All parts have 1 year warranty.
www.ebay.com
This is original style
I thought your pump had a round neck as it was hidden.
Mesa website is probably not up to date, but they list the round one. Perhaps call and if they do, ask for some measurements, looks like it might squeak by. http://www.mesaperformance.com/web_store/web_store.cgi?page=bmwcat/fuelpump.html&category=yes
Thanks for the input nonetheless.
Knowing this isn't an normal issue motivates me to examine the rest of what's going on. I think the pads that those eye bolts sit on (left side in my first picture) might be the wrong way around. I think they're supposed to sit on posts that protrude from the manifold.
There are some good pictures here:
e9coupe.com
I'll go out after work and try to flip them.
Knowing this isn't an normal issue motivates me to examine the rest of what's going on. I think the pads that those eye bolts sit on (left side in my first picture) might be the wrong way around. I think they're supposed to sit on posts that protrude from the manifold.
There are some good pictures here:
FS: Complete set of Weber 32-36 with linkage and intake manifolds for M30
These came on my car when I bought it. Worked great. Moving on to a Motronic motor so I do not need these anymore. Cleaned up and ready to install. $300 plus shipping. Bo. Note: I will include the existing gaskets for reference but obviously you would need a fresh set to install.
e9coupe.com
I'll go out after work and try to flip them.
Last edited:
stphers
Well-Known Member
If you change it up, make sure you get the right length pushrod to match the fuel pump
Thanks, Rick
Thanks, Rick
The mount for the throttle rod seems correct and reversing the pads does nothing as they're symmetrical. When tightening everything back up I pulled on the rod and took up any slack which improved it slightly. All the pictures I've seen have the pump behind that rod. Finally, I ground down a bit of the pump body and screw so it's not putting so much pressure on the rod.
Oh yeah, and since you suggested it, bavbob, I did call Jim @ Mesa. He gets them from BMW and doesn't have any in his shop right now- the last one was ordered last year some time. He said he'd call them and ask what they look like and call me back (not going to happen).
Oh yeah, and since you suggested it, bavbob, I did call Jim @ Mesa. He gets them from BMW and doesn't have any in his shop right now- the last one was ordered last year some time. He said he'd call them and ask what they look like and call me back (not going to happen).
Sooooooooooooooooo what did happen?
Well let's see... get comfortable everyone... it was a dark and stormy night...
When I first installed that new pump the engine went from not idling at all to a nice, smooth fast idle. I blipped the throttle to slow it down and it settled into a higher than normal smooth idle. I backed off the idle screws a turn and everything was great. Later, I went to start it again and it was back to the way it was- no idle but give it gas and it revs. Turn the idle screws in to get it to idle and it kind of fluctuates between rough and almost dying.
I measured the pump push rod and it's about 1mm short so I have one on order. In the meantime and sanded down my extra spacer about 2mm with no improvement.
The pump pictured is one I bought at the outset of this project assuming it was an exact replacement for the smooth (no screws) original. After the fitment issue I did some searching and found one HBChris had suggested (I got it off of Ebay for less but this link might last longer)- https://www.autosurplus.com.au/bmw-2800-3.0s-3.0cs-3.0csl-525-mechanical-fuel-pum
This one fits a little better but no improvement in running. Three pumps, all the same.
I've now moved on to the carbs. Replaced the float needles, checked float height, replaced all rubber lines going back to the tank, tried running it with/without fuel cap (no rush of air), and looked at the sender- seems fine.
Could be a vacuum leak but I used hylomar blue on the spacers and replaced the throttle shaft seals with tiny little bearing sets with no improvement.
I'm still waiting on my driveshaft so this all is being done an hour here, an hour there.
When I first installed that new pump the engine went from not idling at all to a nice, smooth fast idle. I blipped the throttle to slow it down and it settled into a higher than normal smooth idle. I backed off the idle screws a turn and everything was great. Later, I went to start it again and it was back to the way it was- no idle but give it gas and it revs. Turn the idle screws in to get it to idle and it kind of fluctuates between rough and almost dying.
I measured the pump push rod and it's about 1mm short so I have one on order. In the meantime and sanded down my extra spacer about 2mm with no improvement.
The pump pictured is one I bought at the outset of this project assuming it was an exact replacement for the smooth (no screws) original. After the fitment issue I did some searching and found one HBChris had suggested (I got it off of Ebay for less but this link might last longer)- https://www.autosurplus.com.au/bmw-2800-3.0s-3.0cs-3.0csl-525-mechanical-fuel-pum
This one fits a little better but no improvement in running. Three pumps, all the same.
I've now moved on to the carbs. Replaced the float needles, checked float height, replaced all rubber lines going back to the tank, tried running it with/without fuel cap (no rush of air), and looked at the sender- seems fine.
Could be a vacuum leak but I used hylomar blue on the spacers and replaced the throttle shaft seals with tiny little bearing sets with no improvement.
I'm still waiting on my driveshaft so this all is being done an hour here, an hour there.
Make sure the emissions stuff, if you have it, is bypassed.
Hey Ted, perhaps these photos can help. I have a Pierburg and a pair of Weber 32/36s. Anything here that you can see that may be different in your installation?
That's not the stock M30 linkage between the 2 carbs.
@bluecoupe30! - thanks for the pictures! Nice and clean in there! Looks the same- bottom part of fuel pump resting on the throttle shaft.
Here's the fuel pump I linked previously. It fits a little better.
Here's the fuel pump I linked previously. It fits a little better.