filter and maybe a pump

Morning all.we i asked the other day re:fuel filters ...and have decided to put a cav style filter in .....now my Q:is im also thinking of putting a after market 3/4 psi fuel pump in...(did some digging in the archives)..as i think maybe..i need a little more pressure as .sometimes stalls on big uphill crawls...(and no the revs arnt to low.:)).but this is getting beyond a joke.for me....am also looking at putting in a on of switch for auto choke.....as on cold mornings and in heavy fog...she looses all power and that's it ....will still rev but nothing like she should ......stop for a few mins....and away she goes like a rocket......im thinking with the cold air forced down da snorkel the chokes coming on..stop((warms up in the filter box .choke resets and all is good.... (a little of track here sorry)...Q:: is if i put elec after market fuel pump in line to help with pressure...will that do anything to factory pump in da tank.??.and if factory unit ....sh_t_ itself will the extra pump still be able to draw fuel up ...? or will factory pump block of outgoing fuel . cheers BUNDY........................