HELP NO TANK PRESSURE!!

K this is very odd to me maybe someone can help, alright so i got a diffrent airtank mounted under the bed moved the compressors underneath also got all new fitting new valves new airline... i get it all ran check for leaks fix those, have compressors running air pressure gauge says nothing, so i leave them running go to the back crawl underneath, remove my air guage line and its pumping air out, put the line back it let run, turn it ff guage still shows nothing go back underneath pull the airline, no air in the tank at all... leave the airline out go turn the truck back on compressors come on crawl underneath air coming out of the tank, put the line back it let it build turn it off pull the line no air in the tank.... getting irritated about to kick the truck off the jackstands.... I LOVE MY TRUCK!

OH YAH!!! ALSO blowing head fuse and ptc fuse..cant even put a new fuse in blows right when it touches

are the comps mounted upside down?..do you have a check valve inline,and your pulling it off befor that to test it..if so maybe your comps dont like to be upside down..i had one that was that way..said it could mount anyway but didnt work upside down..and the check valve..if you have one may be backwords
as for your fuses ...man i dont know

Id check your check valves off the compressors and id also make sure you have your valves wired correctly.or maybe you forgot to plug a hole on the tank lol.

or a valve plumed backwords..it wont hold air that way

compressors have always been upside down, yes i have check valves, and i was pulling the fitting that holds the quarter inch line, yah i cant figure it valves are backwards, idk its pissing me off though thanks for the help though guys

oh think i figured out the fuses... when i did the wire tuck it had 4 gauge that switch to 8 guage that was going into the box i eliminated the 8 gauge and ran the 4 gauge to the box thinking it is getting to much amperage from that

so far one dump valve is stuck open..... fiiing valve

that would do it