Throttle Body Shop TBS 10320 GM TBI 14 psi "YELLOW" Fuel Pressure Spring TBI 14psi fuel regulator replacement spring Fits: 1986-95 2.8L 4.3L 5.0L 5.7L 7.4L TBI motors Bumps stock TBI fuel pressure from 11-12psi to 14-15psi - fits OEM regulator can Works will most OEM fuel pumps - if pump is not worn 2nd photo shows typical TBI injector assembly these fit Silverado Sierra Suburban Yukon Blazer Camaro Firebird Caprice S10 Jimmy