17112907 Fuel Pressure Regulator Kit Replaces PR113T 19143609

Restore proper fuel pressure to your GM TBI-equipped truck or SUV with this 17112907 fuel pressure regulator kit. Replaces OEM part numbers 17112907 19143609 PR113T and 143-426. This is a TBI (Throttle Body Injection) regulator designed for GM low-pressure fuel systems operating at 9-13 psi — it is NOT compatible with CPI (Central Port Injection) systems that run at 55-61 psi or later high-pressure fuel injection. Always confirm your engine uses TBI before ordering. Compatible with a broad range of 1988-1996 GM vehicles equipped with 4.3L 5.0L 5.7L and 7.4L TBI engines including Chevy C1500 C2500 C3500 K1500 K2500 K3500 Blazer full-size (1992-1994) Suburban (1988-1995) Tahoe (1995) Caprice 5.7L TBI (1991-1993) Camaro 5.7L TBI (1990-1992) Express 2500/3500 (1996) GMC C1500 C2500 C3500 Yukon (1992-1995) Safari V6 TBI and Sonoma/S15 4.3L TBI. The spring-loaded vacuum-referenced diaphragm maintains consistent fuel delivery from idle to full throttle by varying pressure between the 9-13 psi operating range based on engine vacuum. A failing TBI regulator produces clear symptoms. The most common failure is a ruptured diaphragm that allows raw fuel to enter the vacuum line creating a rich condition — black smoke from exhaust fuel smell in the oil and fouled spark plugs. Test this in 30 seconds: pull the vacuum line off the regulator; if fuel drips out the diaphragm has failed. A less common failure is a weakened spring that drops pressure below 9 psi causing a lean condition with hesitation stalling and hard hot starts. Fuel pressure below spec or rapid bleed-down after key-off confirms regulator or pump issues. A quality aftermarket unit from Standard Motor Products (PR113T) or equivalent is a reliable choice for this simple mechanical component delivering OE-level performance at aftermarket pricing. Installation requires basic mechanical skills. Relieve fuel system pressure first by pulling the fuel pump fuse and cranking the engine until it stalls. Remove the old regulator noting the vacuum port orientation. Install the new regulator with the included O-ring and hand-tighten — do not overtighten. Reconnect the single 3/16" or 1/4" vacuum line to the ported vacuum source on the TBI base. Inspect the old vacuum line carefully for cracks hardening or brittleness — a cracked vacuum line causes inaccurate manifold pressure readings leading to rich or lean conditions that defeat the purpose of a new regulator. After installation restore the fuse key on to pressurize and check for leaks with a fuel pressure gauge at the Schrader valve. At idle with engine warm pressure should read 9-13 psi. On vehicles over 25 years old proactive replacement during a tune-up is cheap insurance — the regulator diaphragm hardens with age regardless of mileage.