I have a 1998 Trooper with 70K miles. The Check Eng Light has been throwing 1171 errors (lean condidtion during exceleration). One of the trouble shooting recommendations is to test fuel pump pressure. Shop manual says it should be 44-52 psi. I tested the pressure on the fuel injector rail and the pressure reads 38psi with the ignition on. With the engine running it reads between 35-38 psi. I also tested the pressure by the fuel filter with same results.

Seems like I need a new fuel pump but before I spend $300 on a new one I wanted to see if others agree? Is this typical for a Trooper to need a new fuel pump at 70K miles?

Also, any opinions on after market pumps ($100) vs OEM for $300?

Thanks.