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FUEL PUMP SB8R-Australia
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mortsta



Joined: 30 May 2008
Posts: 61

PostPosted: Sat Aug 01, 2009 11:55 am    Post subject: FUEL PUMP SB8R-Australia Reply with quote

oi oi...how ya's all.
This arvo took the bike for a quick squirt..went to start her up, idling ok, then when i opened her up she just kept dying...all the way home-so would idle but die when throttle on. doesnt seem to be water in the tank. and i dont think its the fuel line so could it be the fuel dead or dying? and if so where would ya get another from?
thanks for help '
morty
byron bay
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madasfook



Joined: 16 Jul 2008
Posts: 221
Location: sunny south west

PostPosted: Sun Aug 02, 2009 6:32 pm    Post subject: Reply with quote

undo the fuel line from the pump to the injectors , turn on the ignition and you should get a good flow from the pump , if not the pump may be blocked or Knackerd , if the bike runs on idle its probily not the pump more like a blocked filter .
on a lighter note my DB2 runs on a R1 fuel pump , a very easy set up Very Happy
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mortsta



Joined: 30 May 2008
Posts: 61

PostPosted: Mon Aug 03, 2009 1:35 pm    Post subject: Reply with quote

eh madasfooook..thanks for your reply...
yeh took the pump apart and the thin gauze mesh was blocked underneath...so that sorted..
BUT, i had oil leaking from the D areas on the cam covers so took em off put some loctite gasket goo on then put em back on went to tighten the 4 bolts and and whammo-broke the fucken aloy cam bracket inside-Why? coz i was doing all this while the engine eas still pretty hot-what a dmb cnt!!
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madasfook



Joined: 16 Jul 2008
Posts: 221
Location: sunny south west

PostPosted: Mon Aug 03, 2009 4:15 pm    Post subject: Reply with quote

Shocked OOOPs
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mortsta



Joined: 30 May 2008
Posts: 61

PostPosted: Tue Aug 04, 2009 8:39 am    Post subject: Reply with quote

no...
ooooooooops fck!
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Tue Oct 13, 2009 5:25 pm    Post subject: Reply with quote

madasfook wrote:

on a lighter note my DB2 runs on a R1 fuel pump , a very easy set up Very Happy


Dude, would you like to explain yourself please.... a R1 pump on a Bim Shocked

No really, I;m still having a mare with the mechanical pump on the 6r and trying to source an electrical pump to whack on it.
I thought the R1 pump was in the tank.
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Admin
Site Admin


Joined: 22 Oct 2007
Posts: 503
Location: Stafford, UK

PostPosted: Mon Nov 02, 2009 6:16 pm    Post subject: Reply with quote

Hi

Loads of carbed bikes have low pressure pumps. Eg, the Yamaha ones used on the FZ750. Fairly low pressure though.

Concern would be if the problem is the air pressure at speed blowing fuel back through the fuel pipes. You can overcome this with a higher pressure pump, but then probably over fuel at low speeds. Not sure if you can get a low pressure fuel pressure regulator, fixing fuel pressure at a few psi over the intake pressure.

All the best

Keith
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Mon Nov 02, 2009 7:12 pm    Post subject: Reply with quote

Don't understand what you mean with the air presure Keith Crying or Very sad
The pump only tops up the float bowls and needs to be low pressure so it doesen't overcome the float valves. The carbs take care of the rest Wink
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Site Admin


Joined: 22 Oct 2007
Posts: 503
Location: Stafford, UK

PostPosted: Mon Nov 02, 2009 11:54 pm    Post subject: Reply with quote

Hi

Airbox is pressurised, so has the same problem as a carb on a blow through turbo setup. At speed the air going into the carbs is under pressure and doing its best to push the fuel back into the float bowl. Normal way round this is that you vent the float bowls to the airbox so they are pressurised by the same amount. But you then need enough fuel pressure to overcome that air pressure.

All the best

Keith
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Tue Nov 03, 2009 12:24 am    Post subject: Reply with quote

GOTTCHA Wink
My float bowls are vented to the air box anyway so that's not causing my problem Crying or Very sad
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Admin
Site Admin


Joined: 22 Oct 2007
Posts: 503
Location: Stafford, UK

PostPosted: Tue Nov 03, 2009 12:26 pm    Post subject: Reply with quote

Hi

Still needs enough fuel pressure to overcome the amount of air pressure in the float bowls. Too low fuel pressure and now fuel will get into the float bowl (well, in reality just a fairly screwy mixture). Too high and too much fuel will get in. But with a ram air system what is too low and what is too high will vary with speed.

All the best

Keith
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Tue Nov 03, 2009 1:49 pm    Post subject: Reply with quote

Right, I see where your coming from now Keith. The air pressure your on about is the air box pressure from the ram air system (Doh)
Well I don't think I'm ever gonna sort that. That would have been caterd for in Bimota's design department.
I had the SB6R set up on a Dyno. No problems then, it made 136.33 RWBHP and 78.58 ft-lbs of torque.
Now it's stood for a couple of months, the barsteward thing wont run properly again.
I'm guessing it's carbs as there's a good spark.
In the process of pulling it all apart AGAIN to look at the carbs AGAIN Crying or Very sad
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Admin
Site Admin


Joined: 22 Oct 2007
Posts: 503
Location: Stafford, UK

PostPosted: Fri Nov 06, 2009 1:13 pm    Post subject: Reply with quote

Hi

I suspect Bimotas design department didn't sort that issue, and that is why SB6 owners regularly have problems with it. Or possibly they did fix it and then someone changed the pump once production started.

My Dieci is a pig to start if it has sat for a while. Once you get it started it will be fine until you leave it again for a long time.

All the best

Keith
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mortsta



Joined: 30 May 2008
Posts: 61

PostPosted: Sun Nov 15, 2009 11:35 am    Post subject: Reply with quote

"My Dieci is a pig to start if it has sat for a while."

fuel goes offff after a while eh!!!
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Sun Nov 15, 2009 2:56 pm    Post subject: Reply with quote

I always check if the fuels orff by tipping a bit on the floor and throwing a match in it. Shocked
This crap unleaded only takes a few weeks and a lighted match wont ignite it so what chance has a incy wincy little spark got Laughing
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