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Q:This goes along with ramairblazer's question. Will it fit the upgraded MFI spider injector on a 1999 Blazer 4WD LS with a 4.3 vortec engine?
A:Hi Ramuh2121, great question! Yes, this fuel pressure regulator is an exact fit for your 1999 Chevrolet Blazer.
Q:where is the fuel pressure regulator located on the 4.3 v6 engine?
A:Hi Ryan, great question! The fuel pressure regulator would be located in the intake manifold housing. If you take the top cover off the manifold and it will be in the back.
Q:will this fit into the upgraded spider assembly? is there a quality difference between this and BWD?
A:There is not much difference between the Wells Vehicle Electronics Fuel Pressure Regulator - Part No. PR155 and BWD Fuel Pressure Regulator - Part No. 23043 in terms of quality. With respect to your inquiry on the upgraded spider assembly we will need more information including the year, make, model, and engine size of your application before we can make a suggestion. Please call us at 1-877-ADVANCE (238-2623) or visit the nearest Advance Auto Parts store and we would be more than happy to further assist you.