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Whatzit thingamajig Cutoff fuel valve solenoid? *for Dual SU's*


PtheDude

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2946519b-8bf0-4b6e-95ee-f1356506809a_zps

 

 

HIYA RATTERS.

 

I've got dual 38mm SU's  that diesel / stumbles like crazy when shutoff.  flails around like I need a fuel cutoff.  thats what this is, right?  

 

Which is Send and receive?  A or B

 

Which side of fuel pump?

 

Is the light nipple a vacuum assist?

 

All thoughts and info appreciated. 

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A fuel cutoff won't stop the fuel already in the SU fuel bowls.

 

Run on or dieseling can be caused by one or more of these...

 

High compression

Too hot a spark plug

Too high an idle

Too rich an idle mixture

Flooding carb

Too low an octane gass

 

Best to just hold brake on and lift the clutch just enough to load the motor and shut ignition off. Motor will stall. If an automatic, shut off in drive then put in park. With 3 or 4 tries this becomes automatic and easy to do.

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I don't know what that is, but any fuel cutoff solenoid has to be installed in the idle circuit, otherwise the residual fuel in the float chamber can keep it running quite some time.  I've had carbs that could idle for 10 minutes with no fuel supply, just the contents of the float chamber.

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  • 1 year later...

2946519b-8bf0-4b6e-95ee-f1356506809a_zps

 

 

HIYA RATTERS.

 

I've got dual 38mm SU's  that diesel / stumbles like crazy when shutoff.  flails around like I need a fuel cutoff.  thats what this is, right?  

 

Which is Send and receive?  A or B

 

Which side of fuel pump?

 

Is the light nipple a vacuum assist?

 

All thoughts and info appreciated.

 

Yes this is a fuel shut off but it does not connect to fuel lines. Both float bowl vents go to the top port. Left port goes to air box. Right port to manifold vacuum. What it does is provide manifold vacuum to each of the float bowls when engine is shut off to stop fuel flow.

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