----[Please read http://ercoupers.com/disclaimer.htm before following any
advice in this forum.]----
It probably would be best not to use it at all during break in.  Many 
shops recommend it not be used for the first 40 hours or so.  Gravity 
fed systems like ours are generally considered more of a liability for 
vapor lock.  You are just thinking about the intake side of the pump 
where it is sucking which might lock but would probably clear itself 
soon enough.  Best bet would be pumps in the tank outputs to keep it 
under pressure all the time.  With car gas as high prices as it is now, 
I don't know why anybody would bother.   Glen Ward
John Cooper wrote:
> I have hundreds of hours on small continentals using MoGas.  No 
> problems.  
> Ever.
> 
> You should check your float level with Mogas, as it may be out of 
> tolerance 
> due to the lower SG.
> 
> Mogas has a lower vapor pressure and is therefore more prone to vapor 
> lock in 
> non-gravity fed systems.  If your pump is above the fuel level in the 
> tank, 
> be aware of the possibility.
> 
> I have never had carb icing using Mogas, but I am very religious about 
> use of 
> carb heat.  In fact, the only surprise attack of carb ice was with 80 
> avgas.
> 
> Make SURE there is NO alcohol in the fuel you use.
> 
> Plugs will last forever.  Exhaust valve deposits will be greatly 
> reduced.
> 
> If you believe in lead as a valve lubricant, mix a gallon of 100LL with 
> 3 
> gallons of Mogas.  (Probably a good idea during cylinder break-in).
> 
> Let the holy wars begin!
> 
> John
> 

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