Fuel pump? My BMW R1200C

Message

remote64us · Tue Apr 22, 2008 1:06 pm

Hi...After sitting in my garage all winter, I have been trying to start my bike. I thought I was getting fuel, because when I checked the injectors they were spraying fuel and everything looked good. New plugs and good spark, but no go. A shot of starting fluid and she roars for 3 seconds...so I think it has to be the fuel. Now I already had fresh gas in the tank,so I wanted to drain the lines. I pulled the lines off just ahead of the fuel injectors thinking when I turned on the key, the electric fuel pump would pump out the old gas. Nothing Can someone help? RANDY

Johnj · #2 Unread post by **Johnj** » Tue Apr 22, 2008 6:23 pm

Does the manual tell you to do that?

BuzZz · #3 Unread post by **BuzZz** » Tue Apr 22, 2008 6:38 pm

Can you hear the pump when you turn the key on normally? When the pump on my old FJ starts up with the key, it makes enough racket to let you know.

Your bike is alot smarter than mine, it might be able to tell that the lines are unhooked and preventing the pump from working as a safety thing. Is the fuel line made of or contain any metal? It may need to see continuity in the fuel system to allow the pump to operate. Or some other parameter is not being met with the lines disconnected.

Have you tried thumbing the starter with the lines off? The bike might only pressurize the system when the engine is starting or running.... actually, this is my best guess now that I think of it....

remote64us · Wed Apr 23, 2008 5:30 am

I dont have a shop manuel...so I'm just assuming that I have an electric fuel pump. The fuel lines are rubber, and I have turned the engine over to see if it would start the pumping. I do hear a hum when I first turn on the key. I thought this was the pump, but It only lasts about 1 second and I get no gas...

BuzZz · #5 Unread post by **BuzZz** » Wed Apr 23, 2008 6:50 pm

If it is fuel injected, it has a fuel pump. That hum you hear would be it, and it should only run a short time to pressurize the system at start up. But if your's is not delivering fuel with lines off, somethings up. How did you determine the injectors were spraying fuel?

You should consider buying a good service manual or a trip to the dealer.

remote64us · Fri Apr 25, 2008 6:17 am

I pulled off the air tubes, and I could see the injectors spraying fuel. The idea in removing the fuel lines was to drain the old gas from the tank pump and lines. I was surprised only a tiny bit of gas in each hose. Ok I guess that was the end of it. So I put a gallon of gas inthe tank thinking this would force the rest of the old gas out. After I drained a bit I would rehook the gas lines but nothing comes out. Is there a fuel filter somewhere?

Gadjet · #7 Unread post by **Gadjet** » Fri Apr 25, 2008 12:11 pm

your fuel pump and filter are inside the tank. best bet is take it to a dealer and let them do it.

a word of caution: the fuel pump is lubricated and cooled by the fuel - do not let your tank run dry or you will burn out the fuel pump and it will be a costly replacement.