Gas in the oil is one of the failure modes of a fuel pump, yes indeed. The relief hose from pump to garb is intended to keep fuel out of the bilge, because when old marine pumps fail (those without the secondary routing) or when automotive pumps fail, they can (also) spill raw gas into the bilge and that is the main issue.
I had some old marine fuel pumps fail a few years ago, and thankfully my sniffer (my nose) picked up a strong gas smell. I opened the hatch and was horrified to smell strong fuel fumes. It was at night. We were waaay out too. I shut everything down except the blower, got down inside with a flashlight, and put my hand down on the fuel pump. It came up wet with gas!
Thankfully the story had a happy ending, but it could have gone very bad. Therefore I recommend going through a marine outlet and paying more for the fuel pump, and getting one that is a certified marine replacement, rather than getting one that will fit the motor and work at a lower cost without the marine safety features.
People like Dan Cook, chriscraftparts.com, marysville marine, etc., can get the real deal, and you can expect to pay a lot more for them too.
Regards, Paul
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