Presure is building and is building the seams on

Preasure your fuel tank. Take a cloth and put over your gas tank fill and use a air compressor to blow air into the tank to build presure. This should build up presure and react the fuel pump to pick up the fuel.

#1 thermostat, #2water pump,#3 plug up radiator.

Crank the engine continuously for 5 seconds and retrieve the malfunction engine codes. If no codes are found, then check the following:-
- Electrical connections in the engine bay area, battery.
-

You have some otyher issue here besides the pressure problem.

why do you keep filling it up? If you overfill either the radiator or the reservoir it is as bad as not filling up...
Is there a temperature issue?
If the reservoir is NOT using, or appearing to 'use' any coolant.. then that is a good thing.. it IS a reserve tank, a reservoir.. tank for overspill and should never be more than 1/3 full..

it has a blown intake or head gaskets

you half to buy a new hose as the presure in that line a clamp will not hold. will hold for few mins but then will blow right off as the presure builds in the engine and the temps of the fluid gets hotter

every fuel tank has a ven't it shoulden't build up too much presure, the vent tube might me full of dirt

maybe water in your tank if the station was getting fuel in their tanks

pressure build up is probably caused by a bad radiator cap try changing this and it will probably help with the problem