Electric fuel pumps PUSH, they do not pull like the old mechanical fuel pumps that were rod driven from cam shafts. Electric fuel pumps don't last real long setup like yours is. That fuel pump needs to be moved back by the tank. I remember back in the '70's when electric fuel pumps made by Holley and others started getting popular and selling like hot cakes, many got brought back to the store as warranty issues that weren't. They were incorrectly installed up by the engines in place of the mechanical (suction) pumps instead of back at the tank where they belong...to push. As for your question about the suction bulb, in theory it won't hurt since its used to prime to the carburetor, and just like boats, once the engine is running, the unvalved bulb becomes passive. The issue might be that the bulb won't survive the output pressure of the electric fuel pump. I'd remove it to eliminate the potential problem. One problem you may have is the size of the fuel line, depending upon the size of the engine its feeding.
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