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I put the adjustable one in mine.
They wont magically give you more power, but if you are having problems they are a fairly cheap place to start throwing parts. As said they are prone to failure on our old motors.
If it can possibly be done with the primer, I think a grease gun would work excellent. Flip the plunger seal and squash until it will hold fuel or submerge the entire gun in fuel. With a check valve or an extra set of hands you could likely manually regulate your pressure...
Look into airless paint sprayers. If I remember correctly they will do some fairly high pressures (low volume of course, not sure how much you need).
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