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Old 02-15-2015, 07:00 PM   #1
proctor
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Join Date: Feb 2015
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I have a gas leak question!



Hey everyone! As you Prolly know, I just got my 84 Bmw 633 to start after sitting over 3 years yesterday. Two questions, is it possible to overprice fuel pump? My battery connection was having an issue so it kept priming and not engaging starter for 10 mins. When I looked at engine on driver side of engine around middle I could see a steady drip of gasoline which stopped after 20 seconds. Once I fixed battery terminal the starter engaged and car ran and didn't leak gas anymore. Anyone got any ideas? Thanks
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Old 02-16-2015, 09:26 AM   #2
1bmw1
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Correct me if i'm wrong, but your engine has carbs right? It's not fuel injected? If so, then you just flooded your carbs by opening the accelerator without the motor cranking. My guess is that it should be fine after you got your starter issue resolved.
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Old 02-16-2015, 02:55 PM   #3
proctor
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Would a 1984 be carburetted?
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Old 02-16-2015, 06:23 PM   #4
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No, it is fuel injected, and no it should absolutely not leak! Check for loose clamps or cracked lines, very common on cars of that age. Or better yet replace any rubber fuel lines that you can.
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Old 02-17-2015, 09:07 AM   #5
cheapthrills
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+1. You cannot overprime a FI system. Fuel pressure returns to the tank after the reg.

My standard replacement items for bringing back a car that has sat for a long time are: fuel hoses, vacuum lines, and brake hoses. All of these rubber items will dry out, crack, and leak.
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Old 12-06-2015, 06:20 PM   #6
Utern
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Cold start valve

I had the same problem with my 82 633 CSi it turned out to be the cold start valve which is found under the manifold on the drivers side. If your lucky like I was it was just a loose clamp on the fuel line, the fuel delivery is under pressure and the clamps need to be tightened. Unfortunately its not that easy to get a ratchet on.
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Old 12-06-2015, 06:21 PM   #7
Utern
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Smile

I see that this thread is old so I have to assume you figured it out, but maybe it will help the next guy with the same issue
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