The cap to my windshield washer tank is missing, I can not find just the cap in parts, my pump works but will not hit the windsheild, is this due to my cap missing?

Thank you, the fluid runs out of the pump fine when I disconnect the hose from the pump. So I thought the sludge on the bottom could not be it since the fluid comes out fine, I just thought maybe the lack of pressure was due to the cap being removed. Is it possible that the pressure loss in the pump can be just that the pump is old and not as strong as it used to be? I cleaned all the nozzles and changed all the hoses, I kep thinking if the pump works and can get the water to the hood at least, it has to be soemthing. Thank you again. Thank you, the fluid runs out of the pump fine when I disconnect the hose from the pump. So I thought the sludge on the bottom could not be it since the fluid comes out fine, I just thought maybe the lack of pressure was due to the cap being removed. Is it possible that the pressure loss in the pump can be just that the pump is old and not as strong as it used to be? I cleaned all the nozzles and changed all the hoses, I kep thinking if the pump works and can get the water to the hood at least, it has to be soemthing. Thank you again.