New Accufab fuel pressure regulator for 84-93 GM 3.8 and 4.3 V6 turbocharged engines. 84-87 Buick Regal – 3.8 V6 turbocharged engines. 86-87 Buick Grand national. 3.8 V6 turbocharged engines. 91 GMC Syclone 4.3 V6 turbocharged engine. 4.3 V6 turbocharged engine.