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Message: [QUOTE="DZL JIM, post: 1440609, member: 153"] Injectors are 175/75% that I fed with a Bosch 044 pump with 5/8" draw straw, and regulated return. I can't recall where I got the return deal 5 years ago, from a guy that got banned from this site for whatever reason, uses hard lines to Aeromotive regulator, then returns back to tank. Factory top filter/supply housing still there and used, had pre-filter and pump on frame rail. The first 044 pump lasted 4 years and over 30k miles. It went out last spring. Replaced it with another 044 pump, which lasted about 1000 miles. I am not after high HP with this truck any more, and just want a nice reliable daily driver, so I put the stock fuel pump back on, with stock lines. I didn't change anything with the regulated return set-up, just swapped the stock pump back in place. Before with the 044 I could hold 65 psi no matter how hard I was on the throttle, it would only drop a couple psi at wide open throttle. Now, with the regulator set at 68 psi, it drops 10 psi just trying to maintain speed at 55 mph. As I push the throttle down, the fuel psi drops accordingly. If I hammer it, pressure will drop to 20 psi. I changed the fuel pump thinking maybe that pump (originally off the truck with 70k miles) was bad. No change in pressure. I know big injectors need fuel, but I would expect with a light foot to maintain speed, there would be no issue holding psi. I can literally move the fuel psi gauge with the throttle pedal, without accelerating or blowing smoke. This has me stumped. Any advice here is greatly appreciated. [/QUOTE]

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