motor issues, carbs dirty maybe?

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i know, ive limped home using the bulb before...just got some time looking around, removed navman inline fuel gauge, its useless. lines clean to bulb. lines clean from bulb to black pipe where there is a connection somewhere (fuel line from motor meets fuel line running through hull somehow). all lines on motor appear clear, but are held on using crazy connections, dont want to void warranty. hate to say it but she may be heading for the shop. also, noticed a good bit of oil stains on lower unit of motor running down towards the foot. unrelated?