3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
Hope somebody can give me an idea. 1985 E30 M10 engine. I am the original owner from new. Refurbished, garaged and used a few hundred kilometres a year. Just had Carburator cleaned Sept cause of poor running. Was fine, last used in September. Several minutes of engine start attempts not even a single firing. No smell of petrol from exhaust so no flooding. The plastic translucent chamber on the fuel line leading to fuel lift pump (replaced last year) is not filling up. Fuel tank is 20% full (unless fuel gauge is wrong). Suspect fuel pump failure. Is there a fuel pump relay in the fuse box. All fuses are fine. Any ideas? Thanks
Started with going down to the local BMW dealer. They couldn't locate the part number on the relay I pulled out ie. 1373912
Trawled the net came up with: BMW BLACK RELAY PT# 61361388364 ALSO KNOWN AS PART 1373912. Getting this over from eBay (keep fingers crossed)
Also noted on a BMW K100 bike forum that a 1984 bike has the same fuel pump relay as my 316 with identical circut pattern and part number (and starting problem too).
Will start fiddling about tomorrow with shorting pin 30 to 87. If I cannot hear the pump (never actually think I heard it in my life) I hope to start it on the shorted 30 / 87 pins. If it does start it must be the relay. Hope I am not making a booboo, I assume that since on Porsche 911 forums I often came across a makeshift get-you-home solution if the DME relay fails while on the road, shorting two pins even with a paper clip does the trick. Fingers crossed!
Disconnected lift pump hose leading to carburator fuel inlet and passed it into a jar. Turned the engine for a few seconds which caused the fuel to be pumped into the jar. Therefore all previous thoughts of blocked fuel feed was excluded.
Checked all electrical connection resistances with multimeter - according to specs.
Dismantled carburator from induction manifold. I tried to blow into the fuel feed inlet. There was complete resistance. I first thought it was a blocked strainer in the inlet.
Removed upper half to expose innurds of float chambers. The needles seemed to have remained in the up position. Removed float pivet and extracted needles. There seemed nothing unusual but cleaned the needle wells. Blew into fuel inlet again free air flow though both needle wells.
Reassembled everything. Engine started first key turn within 5 seconds. Some old fuel could have caused the needles to stick.
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