Hi Alex. The effective length of the rod will have a bearing on the volume of fuel pumped. As has been suggested, find the right one. 
I suppose you could make one the right length with a washer on the back and a nut on the other. 
you certainly do not want it to leak petrol into your sump. 
An alternative is to use your new diaphragm as a seal, pumping fuel through the correct looking AC pump with an electric pump? 
I have seen an engine run its bearings from a leaking diaphragm.
		 
		
		
		
		
		
		
			
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				Bluebell 
 
Carrier Armoured O.P. No1 Mk3 W.  T84991 
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. 
Dodge WC55. 37mm Gun Motor Carriage M6 
Jeep Mb #135668 
So many questions....
			 
		
		
		
		
		
	
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