Ok.. Many times in low GPM pump set ups if you put a filter before the pump you can actually starve the pump. If you had a larger pump it probably would be ok but that small a pump it could cause the issue you are having. I would suggest you put the filter on the return line. Also. a 4 gallon tank with a 4 GPM pump is really running it lean. That means your cycling your whole capacity every minute. The fluid will get hot pretty quick. Is there any way you can add capacity? Larger tank?
Was typing same time as George..
But what he said and I said.. Oil that is restricted on the intake side, like a filter (not recommended) or too fine/small a suction screen.
I think you move the filter and it will work.
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