1977 seacraft cc gas tank

[FishStretcher]

I have a 1977 seacraft with the same gas tank - now having problems with pump ball going flat after speeding up for a few mins then slowing down . was told problem could be in feeder hose in tank - try to back off from tank - afraid to ruin connector any suggestions

Mine was in my new used tank I just put in. Not super happy after I pulled the main tank to add floatation and adjust CG with my heavy motor setup. Verified with a above deck tank and that works fine, but mine would suck the squeeze bulb flat.