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From: Jordan on 16 Apr 2010 19:18 hippo wrote: >>> Never seen a starter motor in a fuel tank before, makes you long for the >>> days of the kick starter. >>> >> Well it would make the old trick of a spanner across the solenoid a >> bit on the spectacular side.... >> > > Yes, I was thinking that. You'd certainly start your day with a bang! > Q: Why is there no evident problem of fuel pump motor sparking causing explosions in fuel tanks? Is there no commutator? Jordan
From: CrazyCam on 16 Apr 2010 19:31 Jordan wrote: > hippo wrote: > >>>> Never seen a starter motor in a fuel tank before, makes you long for >>>> the days of the kick starter. >>>> >>> Well it would make the old trick of a spanner across the solenoid a >>> bit on the spectacular side.... >>> >> >> Yes, I was thinking that. You'd certainly start your day with a bang! >> > > Q: Why is there no evident problem of fuel pump motor sparking causing > explosions in fuel tanks? Is there no commutator? A spark, fully enveloped in petrol, won't do any harm, but, if the tank is empty of petrol, but still contained fumes, then, it could be spectacular. Maybe that's why the instructions always say stuff about not running out of fuel? ;-) regards, CrazyCam
From: G-S on 17 Apr 2010 04:53 Jordan wrote: > hippo wrote: > >>>> Never seen a starter motor in a fuel tank before, makes you long for >>>> the days of the kick starter. >>>> >>> Well it would make the old trick of a spanner across the solenoid a >>> bit on the spectacular side.... >>> >> >> Yes, I was thinking that. You'd certainly start your day with a bang! >> > > Q: Why is there no evident problem of fuel pump motor sparking causing > explosions in fuel tanks? Is there no commutator? > > Jordan There used to be... the 1977-1978 280E Mercedes Benz had a problem with it in crashes. It's what caused my fathers car to catch fire when he crashed (and several others after release) the design was changed for the next model and existing ones had the in tank pump altered. Bit late for him though... G-S
From: LotsaBitz on 17 Apr 2010 06:56 Commodores and many car things have had submerged fuel pumps for donkeys years. Don't know how they work, but if the fuel runs low the pump can and will overheat - its petrol cooled, I kid you not - and stop working. Thats one reason the owners book suggests not running out of fuel. If it gets to pump the dregs maybe thats where the dirt comes in. And changing it involves draining the tank, not too hard in a bike but a large operation in a tintop. hth. ------------- > > Q: Why is there no evident problem of fuel pump motor sparking causing > > explosions in fuel tanks? Is there no commutator? > > A spark, fully enveloped in petrol, won't do any harm, but, if the tank > is empty of petrol, but still contained fumes, then, it could be > spectacular. > > Maybe that's why the instructions always say stuff about not running out > of fuel? ;-) > >
From: Nev.. on 17 Apr 2010 09:56
On 17/04/2010 8:56 PM, LotsaBitz wrote: > Commodores and many car things have had submerged fuel pumps for donkeys > years. > > Don't know how they work, but if the fuel runs low the pump can and will > overheat - its petrol cooled, I kid you not - and stop working. Thats one > reason the owners book suggests not running out of fuel. Boeing place the main airconditioning units directly under the centre fuel tanks in passenger aircraft like the 747, using the fuel in the tank to dissipate the heat. Nev.. '08 DL1000K8 |