hi, i had a glow perry pump vp30, i wanna know how to test if regulates well, i unplugged the carb line and roll the propeller with the hand, it's work, it flow fuel, but when i screw in or screw out the hex screw that controls the flow ratio, it's appear that dosent have anny efect

The Perry Pumps needs the engine to be running as they rely on vibrations to operate.  You can test one by taping it to a hand drill with a small bent nail in the chuck.  In use they have to be mounted to the firewall.

are you sure?, becouse theres a model that work with motor vibration, but is an small engine (os 55ax) and the oscilating pump model its dosent work in that engine, the pump needs to drill a hole in the carter engine and plug a presure tap and a line to the pump.

You're right. I'm wrong. The VP-20 is what I was thinking. The VP-30 is a regulating pump that has an impulse line from a crankcase tap.

Never used one of those.

The VP20 osillating pump is the pump that relies on torsional vibration in the plane of rotation. The VP30 that the OP is talking about is the regulating pump that requires a crankcase tap to power a diaphram.

Jorgen turning the engine over by hand I beleve will not be sufficient for the pump to do its job.

John

yeah you right, i dont know whow to check is regulating the fuel flow, but, you turn the propeller at hand and it's start to draw fuel very quickly after the 2nd or 3erd turn, very nice whow it's work, i didnt think that it could have the enought strenght to deliver the fuel at that increible ratio.

I have heard of this but have not tried it..  Get about a yard of extra fuel line.  Put a t fitting between the fuel pump and carb and run the yard of fuel line up a stick, I would suggest a yard stick with the line taped to the scale.  The line should be open at the top.  The presure as supplied should be about 1/4 PSI which is less than a foot of fuel head, or about the same as muffler pressure.  It should not go over the top, however I suppose it could, especialy right at startup before the regulator has a chance to react.  If I were to do this I would plug the top of the line, then unplug it after the engine starts, ready to plug it back right away.  In fact I would probably use my hemostat.

More info from the manufacturer:

http://www.perrypumps.com/instructions.htm
http://www.perrypumps.com/products.htm
http://www.perrypumps.com/VP-30%20and%20VP-40.pdf