I've ordered a new pump, Pierburg was the only option I could find. To be honest I'm not 100% on this but if I fit the new pump and see good delivery before connecting to the carbs then at least I can rule the pump out. I've never had it run badly on the road, this is a fairly recent development, although wear in a component will tend to produce a slow deterioration, I can't say I've noticed it driving the car. Anyway, I'll report back once I've fitted and tested the new pump.
Mechanical Fuel Pump Testing
- Thread starter E3_UK
- Start date
Mine delivers less than that, thanks for doing this. I have stripped it and checked everything is ok and it does deliver a decent squirt when manually operated.
yes, those ones are not very good
you should look for the sealed type
BTW, we do not know which kind of pump @E3_UK has in his car, i would suggest some pictures
specs for fuel pumps in carbed cars state 0,21 to 0,25 Bar pressure
i have a manometer in line with the pump before front carb to check this easily, i would recomend it
note, my experience with these fuel pumps is that the small piece that transmits the movement between the pushing rod and the memebrane rod can be damaged due to wear, it is yellow metal,...just in case
again, there are many different models,
post a pic, it wont hurt you
some old information,...
www.e9coupe.com
mechanical fuel pump - pierburg ???
bear in mind this if you need to order for a new pierburg mechanical pump: if you order the adequate part number for this pump, you will find a pierburd pump offered in several places,...e-bay, jaimic, bmw,... it will be in some cases the old-style rubber membrane fuel pump by pierburg, be...
www.e9coupe.com
the repair and the case of the wear part,...
e9coupe.com
need a mechanical pump APG
need a mechanical pump APG - solution + interesting info hi after checking all my possible sources in europe with no success i am trying this here: i need a new mechanical fuel pump for my e9, 3.0 CS, dated 1971 BMW reference is: 13 31 1 260 677 the original one (still in the car now)...
e9coupe.com
This is the current pump
20200127_205310 by Robin Derrick, on Flickr
20200127_205234 by Robin Derrick, on Flickr
20200127_205310 by Robin Derrick, on Flickr20200127_205234 by Robin Derrick, on Flickr
The rebuild kit is 13311255184, not sure if it is available any more, save an eBay search. I rebuilt one a few years back, you need to make sure the diaphragm is tightened in place with the pump in the middle of it's stroke so it is not stretched one way or the other. Some other tips here:
e9coupe.com
Cleaning carbs and fuel pumps
Is there a rebuild kit available for the Zenith carbs for my 73 3.0cs? Is there a rebuild kit for the manual fuel pumps? Parts cleaner safe? I've started working on one of the cars, the engine has been sitting so I would like to remove, soak, clean and rebuild. Outside of dropping and...
e9coupe.com
This is the current pump
that is the veryvery early one
it s due time to change it, yes
have you checked the rod balancer like in my second thread fix
Yes, good idea. I'll keep the original pump and will overhaul it eventually.
Top quality aftermarket part again!. Someone has been very heavy handed with the deburring tool.
20200201_191749 by Robin Derrick, on Flickr
20200201_191809 by Robin Derrick, on Flickr
20200201_191749 by Robin Derrick, on Flickr20200201_191809 by Robin Derrick, on Flickr
Looks like they ground off the brand stamp
Why would they do that ?.
Top quality aftermarket part again!. Someone has been very heavy handed with the deburring tool.
that is the wrong one
unfortunately
they were an italian brand manufacture, i can not remember the name, not pierburg, but pierburg wanted to sell them in their pierburg boxes
Why ?
It should work fine
Well my car didn’t start today, so I’ll be doing the jar test tomorrow. The engine wanted to start with starter spray, so it is safe to assume that I have a fuel issue and not an ignition problem. My gas is two years old, my fuel filter only has about 10 miles through it. If the pump checks out, I’ll try new gas gravity fed to the carbs.
I agree. I have purchased many OEM parts for my E39Touring, that had the brand ground off. I suspect it said BMW, but was being sold under the actual manufacturer name. Regards the fuel pump. I went through this exercise a couple years ago. Read all that was out there. Believed there were some "copies" or substandard Pierburg units circulating. Was ready to move to some electric conversion. Then bought a new battery, replaced all rubber fuel line parts, installed check valve, put my "suspect" Pierburg back in place, and everything worked fine. In the past, my weaker battery could not summon enough fuel all the way to the carburettors, after a couple weeks of sitting, and the reduced power from extra long cranking on the battery, would lead me to think fuel pump was not working. I was wrong. Volts + new rubber hose + tight fittings + check valve = success. Hope you have same good fortune. Mike