When you replace the pump you'll be able to see into the tank
and have a look and see if the dish in the bottom of the tank that the pump sucks fuel from is full of GuNk
I'm sure you could clean it out from the hole the sender/pump goes into
Then again if your tank is now pretty full of fuel it might be a little more difficult
and you might have to syphon the tank dry to get rid of any GuNK
Best of LUCK
and have a look and see if the dish in the bottom of the tank that the pump sucks fuel from is full of GuNk
I'm sure you could clean it out from the hole the sender/pump goes into
Then again if your tank is now pretty full of fuel it might be a little more difficult
and you might have to syphon the tank dry to get rid of any GuNK
Best of LUCK