I have been looking at this site for about a year and a half since I bought my 00 955i daytona but this is my first post. I recently did a little spring maintenance... plugs, air filter, oil change. While removing the fuel tank and air box I took precautions to label all the connections for an easy reassembly. Or so I thought. when I went to put the tank back on I could not locate the tube that came off the fuel pressure regulator. The fuel pressure regulator on this model is on the tank on the exterior of the fuel pump mounting plate, just next to the two main fuel lines that clip off. I know It was on there when I took it apart and it is not on my garage floor? There is a tube that comes off the bottom of the airbox that I thought was a drain tube or vent, it looks to be the same diameter But I dont think that is where it came from. Does anyone know where the other end of the fuel pressure regulator hose goes. I know it was a rookie mistake but at least I did not have any parts left over...this time. Thanks

that tube coming off the airbox connects to your fuel pressure regulator.

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Speed thrills!

Thanks. It seems to start and run without it but I didn't give it a road test. I'm gonna hook it back up correctly now and do that road test..... its going to be good weather today and its been a long New Jersey winter.

nosurf, The adjustable fuel pressure regulator's connection to the airbox is only there for the unlikely event of positive airpressure in the airbox.

Brad

Thanks Brad, I read a few posts of others who had no tube at all and they seemed to have no negative effects but I knew i took one off during teardown. I took it for a road test and all is well. Its probably all in my head but I swear its running better, with the new plugs oil and filters. Its kinda like when you wash and wax your car and it feels like its faster.
Tony

Originally Posted by bradtx

nosurf, The adjustable fuel pressure regulator's connection to the airbox is only there for the unlikely event of positive airpressure in the airbox.

Don't think so Brad!
Connection to airbox is there for emissions control.
A lot of models don't have anything connected to it, but depends on the market & model year (CA models for example have it routed to the carbon canister).
Bottom line is, you don't need to connect the regulator output to anything but it appears that you may have the correct connection with the one you found.

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GSXR 1000 Front End Swap

DEcosse, On my '98, which happens to be a Cali emissions unit, the FPR still connects to the airbox. All the Cali emission's canister does is to prevent fuel vapors from venting the fuel tank straight to the atmosphere by routing the fuel tank vent to the cannister...remember, thanks to your help and other's I learned more about this than I wanted to awhile back...may also have some decel function also, but there's so darn little info I haven't been able to verify that.

Brad

Originally Posted by bradtx

..... All the Cali emission's canister does is to prevent fuel vapors from venting the fuel tank straight to the atmosphere by routing the fuel tank vent to the cannister....

I'm sorry, I'm wrong - you are correct on that connection.
I had thought the FPR output also hooked into that but appears not.

It is still emissions control however, even if hooked up to the airbox.

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GSXR 1000 Front End Swap

Well this is interesting. I, too just did a little spring maintenance (of course, mine was mandatory due to some bad Fall maintenance by a Dealer) and my CA 2003 Sprint didn't have anything connected to the pressure regulator. I couldn't find anything that looked like it coulda, woulda, shoulda, been connected to it so I went to the (different) dealer and asked. They said nothing should be connected to it.

I do have an open (but much larger diameter) port on my charcoal canister, but that is the only thing I currently see that obviously looks like it is missing a hose. And, yes, mine too is running exceptionally well.

Coroja, If it's the hose I'm thinking of on the RH side of the cannister, it's the atmosphere vent. On mine there's a hose connected and it simply runs up the subframe. It doesn't have any caps or filters attached. Just a hose.

Brad