Please help. Fuel pressure drops with rpm Hi All First, I did do a search and couldn't find anything. I am guessing that my setup isn't close to being substantial for my engine. Here it is: I just installed a LQ4 whipple 2.9L in my 73 Camaro. I have a Ricks tank that has a tiny opening. I tried squeezing dual pumps in through the opening and they just won't fit. I have a new Walbro 450 in tank right now with -8 feed, -6 return. I drove the car a tiny bit last year and it seemed to be going lean while trying to gently accelerate. I started the car recently and while in the garage I revved the motor up a bit, maybe to 1800-2000 rpm and I watched the fuel pressure drop from 43 to about 38. So I know that I have an issue. Any recommendations to what I should buy would be appreciated. Thanks, Roman |
Is your fuel pressure regulator vacuum referenced? Your fuel pressure will drop when you let off the throttle when revving. |
Originally Posted by JoeNova
(Post 20063892)
Is your fuel pressure regulator vacuum referenced? Your fuel pressure will drop when you let off the throttle when revving. Thanks. |
Fuel pressure seems a little lower anyway. Why not increase it to 58 PSI? |
That is true. For some reason, I remembered the stock fuel pressure to be at 43?? I don't know why that number has stuck with me all of these years. It shall be increased to 58. Thanks Joe, for pointing that out. Thanks, Roman |
Most fuel injectors are rated at 43 PSI. A lot of fuel systems have operated on that pressure at some point. Most after 1999-2000 operate on 58 PSI, except direct injection. |
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