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MFI help / final issue
Some tips are appreciated. I have a strange problem with my MFI pump. 5 out of 6 fuel lines provide more then enough fuel (with and without the injector). Only the fuel line for cylinder 1 (with and without injector) provides hardly any fuel. How is this possible? Fuel line already cleaned and nothing is blocking.
THANKS for any help / advice! Ed |
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12-01-2009, 06:21 AM
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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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If you pull the left rear side cover from the pump, you are likely to find that the #1 fuel plunger is stuck.
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Several BMWs |
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12-01-2009, 06:27 AM
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Registered
Join Date: Sep 2009
Location: Virginia
Posts: 83
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pump
The #1 piston is probably stuck in the bore of the injection pump. Shame its on the side that you can't really get access, but the plates on each side allow you to see what is going on in there. You will have to remove the pump to remove the plate and check it out, maybe you can free it up with some lubricant before having to send it off for repair. There are numerous posts here that will help you, do a search on MFI and see what pops up. Best of luck!
Cole |
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12-01-2009, 06:27 AM
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Thanks, I will check asap. anybody knows a MFI rebuild shop in Germany?
Ed |
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12-01-2009, 07:16 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,492
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More wisdom from Warren (Early_S_Man): "B-12 is the preferred solvent for cleaning a gummed pump ... check the Pelican MFI Tips page!
Drain all gas, oil, or ATF out ... Tape up all of the fittings and clean the external areas of the pump with acid brushes, spray carb or brake cleaner ... blow off with compressed air! Then, remove all of the solenoids [and thermostat] and fittings and bag, along with sealing rings ... and remove all three cover plates, and bag them with hardware and the rubber gaskets. Next, find an appropriate-sized metal pan at least 6" deep so it can be completely submerged in Berryman's B-12 Chemtool. Completely cover pump with B-12 ... while wearing HD solvent proof gloves ... turn over pulley several times to get solvent into all passages Allow to soak for at least 24 hours with the pan covered by a larger pan or cardboard box ... raise pump up, and work the pump rack and turn the cogged pulley over a few times. If the rack return movement has improved, submerge again and allow to sit for another 24 hours. If solvent is discolored & dark, or dirty ... drain and refill with clean B-12. When rack movement is free and ready to finish cleaning ... blow off/out with compressed air."
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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12-01-2009, 07:31 AM
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Sound like a good DIY job. I'll give it a try (can always bring it to the repair shop if this fails).
The pump is still connected. Any last tips how to get the plunger going without removing the pump? Will save me a lot of trouble... Thanks, Ed |
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12-01-2009, 08:10 AM
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Registered
Join Date: Dec 2000
Location: The Hague, Netherlands
Posts: 806
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Quote:
or MST Mechanik UG aus Ergoldsbach - Motorenteile Bearbeitung Porsche Tuningteile Herstellung Motoreninstandsetzung f - Teilebearbeitung
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Peter '13 981S '73 911T '05 996 4S cab, now gone '70 911S Targa, now gone |
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12-01-2009, 10:31 AM
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Any final thought before I dismantle the pump?
Thanks, Ed |
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12-01-2009, 12:19 PM
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Kermit
