The more popular way of accomplishing the same thing is to use a Cline or Iron Bay regulator. With these two systems (two-stroke) the fuel tank is pressurized via a crankcase tap and a one way valve. The regulator then senses the vacuum at the carburetor and adjusts the flow of fuel from the now pressurized fuel tank. This appears to eliminate the extra plumbing that is required by the Perry pump system to accomplish the same thing. Yes, the Perry pump is a bit cheaper, but not when you buy the attendant Perry pump carburetor that restricts the fuel flow to more manageable levels.

For me, the Perry pump is complicated and varies much more plumbing and interaction than either the Cline or Iron Bay fuel pressure regulators. Others may disagree. I have used the Perry system in the past with success and currently have quite a few older pattern engines with the Perry pump system installed and working fine. For newer projects/engines, I prefer the Cline and Iron Bay system, which emulates the YS fuel pressure system as used on their now out of production two-stroke engines (before supercharging).

None are a simple bolt-on, Plug-N-Play system. If you intend to use one of these systems, be prepared to have to learn their theory of operation and their idiosyncrasies.

If you can afford it, just buy an engine that already comes equipped with a built-in system and take your financial lumps up front. You'll be glad that you did when you see the work that others without factory systems experience. BTDT. Good luck, whatever you decide to do.


Ed Cregger