【Replaces OEM Numbers】Direct replacement for part numbers 17112907 19143609 PR113T and 143-426. This is a TBI (Throttle Body Injection) fuel pressure regulator for GM low-pressure systems — operates at 9-13 psi. NOT compatible with CPI (Central Port Injection) or later high-pressure fuel injection systems.
【Diagnose & Fix Common Symptoms】A failing TBI regulator causes hard starting rough idle black smoke from exhaust poor fuel economy and stalling under load. Most common failure: diaphragm rupture — check by pulling the vacuum line off the regulator; if raw fuel drips out the diaphragm has failed causing a rich condition. A weak spring causes lean condition with hesitation and low pressure below 9 psi.
【Quality Build】The spring-loaded diaphragm design is vacuum-referenced — adjustable pressure between 9-13 psi to maintain consistent fuel delivery from idle to full throttle. A simple mechanical part with no electronics making quality aftermarket options a reliable alternative to dealer pricing.
【Hassle-Free Installation】Relieve fuel pressure first by pulling the fuel pump fuse and cranking the engine. Remove the old regulator noting vacuum port orientation install the new unit with the included O-ring and reconnect the single vacuum line (3/16" or 1/4" ported vacuum source). Inspect the old vacuum line for cracks or hardening and replace if brittle — a cracked vacuum line causes rich/lean issues even with a new regulator. Verify 9-13 psi with a gauge at the Schrader valve after installation.