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Author Topic: Another question about fuel shutoff rule  (Read 2198 times)

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Offline donpearsall

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Another question about fuel shutoff rule
« on: June 25, 2019, 02:03:06 PM »
I sent an email about this to 'tech@bonnevillespeedtrials.com' but have not gotten a response yet.

Just checking - Has anyone passed tech inspection regarding this requirement by having a vacuum operated petcock? With this type of petcock, gas will not flow if the engine is not running. It is handlebar operated by virtue that the engine kill button is on the handlebars. Press the stop button, the engine stops, and the fuel flow stops. It is just the same as a fuel pumped engine - press the stop button and power to the pump is gone.

Any input on this?

Thanks
Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline Pippi2

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Re: Another question about fuel shutoff rule
« Reply #1 on: June 25, 2019, 07:50:41 PM »
(Forwarded to our technical inspection team for official response)

Offline donpearsall

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Re: Another question about fuel shutoff rule
« Reply #2 on: June 25, 2019, 09:05:06 PM »
Thanks much Linnea!
Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline yamagamma

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Re: Another question about fuel shutoff rule
« Reply #3 on: June 26, 2019, 12:05:31 PM »
From my experience that's only allowed in production classes.
Old enough to know better!

Offline Stainless1

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Re: Another question about fuel shutoff rule
« Reply #4 on: June 26, 2019, 07:48:40 PM »
It seems the one I had with a vacuum petcock had a reserve position that did not require vacuum. 
But that was a long time ago... Tech  will get back to  you
 :cheers:
Stainless
Red Hat 228.039, 2001, 65ci, MSA Bockscar Lakester with a little N20 
MSA Bockscar Lakester #1000 my fastest mile 245 and change, 84 ci turbobusa motor... but Corey's 233 MPH H/BFL record is still 3MPH faster than mine.

Offline donpearsall

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Re: Another question about fuel shutoff rule
« Reply #5 on: July 14, 2019, 10:32:55 PM »
I did get a response from Drew Gatewood, Chief AMA Steward for BMST. He said that the vacuum petcocks are not acceptable for this rule.

As was already discussed here, the acceptable petcock shut-offs are the handlebar mounted cable system like Pingel sells, or the electric solenoid shutoffs. So since I don't want to mess with a custom order like the Pingel requires, I am going for the solenoid.

Just thought this rule interpretation might be asked again so a search here will find it.

Don
550 hp 2003 Suzuki Hayabusa Land Speed Racer

Offline yamagamma

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Re: Another question about fuel shutoff rule
« Reply #6 on: July 22, 2019, 12:18:13 PM »
Watch out for the fuel flow through some of those solenoids, some are sold as 1/4 inch but the actual hole inside when the valve is open is more like 1/8 inch. I try to stay away from electrical on the salt. A cable operated fuel valve is bulletproof. I just drill a 1/16th hole in the pingel lever and attach a deralleur gear cable off a bicycle. Magura make a nice handlebar lever that gives plenty of travel. Rig up a bracket for the cable and you are done.
https://www.amazon.com/Magura-14AL7-Choke-Assembly-0550845/dp/B00230I156


Old enough to know better!

Offline maj

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Re: Another question about fuel shutoff rule
« Reply #7 on: July 22, 2019, 04:13:26 PM »
We recently put mechanical fuel pumps on the Aussie bikes , for high flow on methanol,
big capacity bypass valves needed there ,  used bicycle brake levers and cable setup to control it
Bicycle shop guy was great , spent a bit of time finding levers that were not too obtrusive to mount , and gave us lots of spares to create or repair cables any time
Then we shortened the lever and set up for one finger control  like a hot start lever on a dirt bike


Offline Frenchinjection

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Re: Another question about fuel shutoff rule
« Reply #8 on: August 01, 2019, 04:18:23 AM »
A question I am asking now of SCTA.  Should the tap stop the fuel getting into the engine, or stop it getting out of the tank?

Offline Doc B.

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Re: Another question about fuel shutoff rule
« Reply #9 on: August 01, 2019, 09:48:37 AM »
Quote
A question I am asking now of SCTA.  Should the tap stop the fuel getting into the engine, or stop it getting out of the tank?

You should probably ask that question in the SCTA Rules forum

http://www.landracing.com/forum/index.php?board=7.0

Offline Frenchinjection

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Re: Another question about fuel shutoff rule
« Reply #10 on: August 01, 2019, 09:51:31 AM »
That's where I started, I am now asking the people directly.

Offline salt27

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Re: Another question about fuel shutoff rule
« Reply #11 on: August 01, 2019, 12:06:15 PM »
A question I am asking now of SCTA.  Should the tap stop the fuel getting into the engine, or stop it getting out of the tank?


My understanding of the rule is that if the shutoff is not at the tank then the fuel line to the shutoff must be fire sleeved.

So either should work but get the OK from the SCTA. 

  Don
« Last Edit: August 01, 2019, 12:12:13 PM by salt27 »

Offline Frenchinjection

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Re: Another question about fuel shutoff rule
« Reply #12 on: August 01, 2019, 03:17:13 PM »
It still does not answer the question - Should the tap stop the fuel getting into the engine, or stop it getting out of the tank?  Rule 7.B.2.5   By the way all the lines are Aeroquip.

Offline maj

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Re: Another question about fuel shutoff rule
« Reply #13 on: August 01, 2019, 04:03:19 PM »
My understanding of the "unvalved fuel line must be fire sleeved " says in itself the fuel tap does not have to stop the fuel getting out of the tank and that any fuel line before the tap or after a return type pressure regulator in the case of efi has to be protected   

Offline Frenchinjection

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Re: Another question about fuel shutoff rule
« Reply #14 on: August 02, 2019, 06:32:50 AM »
Thanks Maj.  It answers the question indirectly in that UN-valved lines are allowed if fireproofed.  The question of Fuel Shut-off for "fuel" class bikes still exists.  A lanyard or power kill does this for EFI with both mechanical and electric pumps because the solenoids switch off.  If you run Nitro then stopping the fuel getting into the engine IS the most important OFF switch you can have. 

Perhaps a redefinition of the Fuel class is required to separate Nitro from non nitro.  If you think about it, breaking the seal on a Gas class bike to run in fuel should require you to be tech'd as a nitro bike

I have asked all these questions and more direct to the guys who matter, lets see what they come back with after s/w