7-9psi sounds high for a stock pump... but still not high enough to cause a problem like that. I think you need a carby kit, and tighten down your screws properly. I had a stock Toyota fuel pump on my 32/36 for quite some time with no dramas after a kitting. Then that carby went onto a 4k and stayed there for even longer. Both ran stock Toyota fuel pumps (New 18R pump on the first one).
Cheers, Owen
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