On my aplications the santoprene diaphram hold up the best. The 8000-543-238 or the 8000-813-239. Normally the 239 is what we use as its aplication is for large engine. A 8000-343-236 is a 60psi pump but it can be adjusted up to about 100psi. It uses a smaller motor and has all Viton valves and diaphram. The 239 is a 150psi pump which we turn down to about 100 to 120 depending on use.
One thing you must alway remember about Shurflo pumps, there is about a 15psi drop before pump comes back on. So it the pressure is set at 100 it has to drop to 85 before it comes on. This is not normally a problem but you need to be aware.
As a note stay with methonal as your alcohal and do not use any mineral based lube.
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Brad
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