Hi, I've been thinking about liquid propane injection lately using nitrous solenoids as shown here:
http://www.diy-nitrous.fsnet.co.uk/nitrous-solenoid.htm

The setup I'm contemplating is a turbo motor and I would like to add liquid propane for its high octane and how it would lower the intake temperature as it phase changes.  I may try to go pure propane eventually, but for now I want to use propane assist so to speak. I'm running megasquirtnspark extra so it would be easy to trigger the solenoids only when needed, and lean the gasoline maps to compensate so it doesn't get overly rich when the propane kicks in.

in order to ensure I will be getting liquid and not vapor when the solenoid fires I was thinking of setting up a fuel pump with return to circulate the propane and purge the vapors.  The question is what kind of pump do I need?
http://www.caranddriver.com/article.asp?section_id=26&article_id=2279&page_number=1
That article says a corvette fuel pump, so does that mean I can use gasoline stuff?

From reports I receive from overseas, across the pond to the west and the east, the US appears to have a more aggressive sludge problem.  We analyzed fuel injected options for the 2007 advanced forklift study and all of the FI participants withdrew their systems from the technology study because they were concerned that if their system was chosen for the program, it would not survive the testing due to sludge buildup.balance valve

The sludge appears to be plasticizers from hoses (problem solved when type 3 hose is used across the board) and pump lubricants (not miscible with liquid propane, tends to settle when heated and the lighter gases vaporize).  Not sure what Europe, Asia, and Oz uses, but the reports I get from there does not support the same conclusion.  The US motorfuel market is only about 17% of the total LPG consumption where it would be hard to justify a fuel quality tighten up.

There are only a handful of additive suppliers in the US, and when researching the products, it appears to come from only two or three producers.  One issue is where to administer the additive, at the bulk tank, where everything is additized no matter where it goes, or during motorfuel refueling via a proprietary connection.  Putting it in manually works but will not fly with the general motorfuel public.

We have several Ozzies on this panel, maybe they can share some insight on their experiences with LPG 'over there.

As for the diesel fumigation issue, this is one of the modern snake oil / witches brew topics.  Almost all of the websites hawking the use of propane with diesel advertise increased power due to the "propane making the diesel burn more fully" or "acting as a catalyst to insure the full burning of diesel"!  HAH!  All that is happening is more fuel is being put in an engine that already has excess air.  Call it BTU plus BTU plus air equals heat.  

To my knowledge, there has not been one diesel fumigation system with propane that has been EPA approved for reduced emissions, although it appears that several have been tested.

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