Running out of gas - BMW Luxury Touring Community
 
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post #1 of 9 Old May 26th, 2010, 5:42 pm Thread Starter
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Running out of gas

Clymer Manual
Chapter 7 page 237
bottom right of page. #4

Quote

"The fuel pump is cooled and the bearings are lubricated by the fuel passing thru the unit. Do not run the fuel tank dry. If the fuel pump is operated without fuel, its bearings will be damaged.
If damaged the fuel pump must be replaced as a unit."

I believe the person whose bike would not start for four months just went thru this.

Eric von Laue

3Cyl Kawa ( a long time ago)
450 Yamaha Seca ( maybe it was a Maxim )
1100 Honda Magna
650 Honda XR ( to Guatemala and back)
1990 Honda PC800 ( Mountain Mama )
2000 BMW 1200LT ( Maxamillion )

Keep the rubber side down
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post #2 of 9 Old May 27th, 2010, 5:54 pm
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Re: Running out of gas

Just curious, how can you run the bike without fuel?

BJ
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2005 LT Gold (traded in for '07)
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post #3 of 9 Old May 27th, 2010, 6:17 pm
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Cool Re: Running out of gas

Quote:
Originally Posted by bjedruszczak
Just curious, how can you run the bike without fuel?
If you turn the ignition on the fuel pump will run until it has reached prime pressure on the fuel rail. If there is not sufficient fuel the pump could run until it burns up.

John

John & Marilyn Fisher
'00 K1200LTC "Katie"
'95 Triumph "Tigger"
'12 Triumph 800XC "Tigger II" (RIP)
'12 Triumph 1200 Explorer "Shadow Tigger"
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post #4 of 9 Old May 27th, 2010, 7:40 pm
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Re: Running out of gas

Quote:
Originally Posted by AlaskaFish
If you turn the ignition on the fuel pump will run until it has reached prime pressure on the fuel rail. If there is not sufficient fuel the pump could run until it burns up.

John


It is a timed event from the Motronic controlling the fuel pump relay. That relay also feeds the 12v to the coil, injectors and the purge valve. There is no feedback to the Motronic (electronically) on fuel pressure. If you check the injectors the 12V goes away when the fuel pump stops after a key on event.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 9 Old May 27th, 2010, 8:50 pm
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Red face Re: Running out of gas

Quote:
Originally Posted by jzeiler
It is a timed event from the Motronic controlling the fuel pump relay. That relay also feeds the 12v to the coil, injectors and the purge valve. There is no feedback to the Motronic (electronically) on fuel pressure. If you check the injectors the 12V goes away when the fuel pump stops after a key on event.
Well I guess I stand corrected then John. Sounds like they may have designed a safety into the system that I had not even thought about. Bottom line is that you do not want to keep running the pump if there is no fuel available.

John

John & Marilyn Fisher
'00 K1200LTC "Katie"
'95 Triumph "Tigger"
'12 Triumph 800XC "Tigger II" (RIP)
'12 Triumph 1200 Explorer "Shadow Tigger"
Hillsboro, Oregon

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post #6 of 9 Old May 28th, 2010, 9:34 am
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Re: Running out of gas

Basically all fuel injected cars have used this exact type of fuel pump system since the mid 1980's. I think it is a pretty bullet proof design. While it is admirable to treat your motorcycle kindly, I don't think this is a scenario worth missing mass quantities of sleep over.

Does anyone here worry about running their Buick's fuel pump out of gas?

My $0.02

Spaghetti
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post #7 of 9 Old May 28th, 2010, 11:56 am
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Re: Running out of gas

I try to keep enough fuel in the tank to submerge the pump.

I have direct experience with this.

A friend's wife always put in $5 of fuel in her van.. (that would put 3 gallons or MORE back then...)

This kept her van always "bouncing" on the "E"... (she was afraid of someone stealing fuel.)

We replaced the fuel pump every other month for a year... finally "Auto Zone" refunded his money saying.. "We can no longer honor the replacement because something is wrong with your installation."

ER... ok....

We asked her to start keeping at least a 1/4 tank of fuel... Guess what? The van got another 100k miles without the pump failing...

Sheer luck...? Nope.

...............
J.M.J...
Dcn Channing

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post #8 of 9 Old May 28th, 2010, 3:13 pm
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Re: Running out of gas

x2........The pump really does need to be in the gas..........It's not like the gas in the bottom of the tank isn't going to get used, but I always keep my tank topped off just because of the EFI.........$ .02.........
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post #9 of 9 Old May 28th, 2010, 3:36 pm
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Re: Running out of gas

The early electronic fuel pumps for carburetors were exterior mounted. Everything is in the tank now as far as I know. Anyway I've never seen a newer injector pump that wasn't in the tank.
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