What to do if AIRLESSCO LP540 Hi Boy B primes but has no pressure?
- JJennifer BarnesAug 4, 2025
If your AIRLESSCO Paint Sprayer primes but delivers poor or no pressure, try the following: * Increase the pressure by adjusting the pressure settings. * Clean or replace any clogged filters, including the gun filter, inlet filter, and manifold filter. * Service the outlet valve. * Clean or replace the prime/pressure relief valve (866428). * Tighten the packing nut or repack the unit if the packings or piston are worn.






