![]() Only that can tell you if you have fuel supply issues. You don't know if your current one is or isn't providing enough, so check your pressure when you're having issues. The only time the gph figure matters is when your shopping for a bigger pump because your current one doesn't provide enough. It would be nice to have an actual flow figure at 5 psi, vs something extrapolated from the graph.īut at the end of the day, the gph doesn't matter to the engine, as long as it has 5 psi to the pump inlet. Your holley red pump looks like it will only supply around 5 psi, because at 6, it nose dives. I don't know where you got your figures for fuel flow requirements, but if the injection pump requires 50 gph, and you supply more then that, it shows up as pressure in the system /less then that will and it will show up as vacuum. The gph figure doesn't matter, as long as the lift pump delivers enough flow to have 5 psi at the injection pump at all times. If your pressure to the lift pump is within specs, then your flow is fine. Gonna troubleshoot what I have first of course, but it's almost undrivable on highways over 55mph right now so something has to be done. Perhaps the 14psi Holley blue (or black) with a regulator set to 6psi would be more appropriate, giving it a more constant pressure. ![]() Regardless, 4.5 is less than all of those. Some people say 5, some say 6, some say 7. What pressure the IP wants seems up for debate. Since pressure to the IP messes with timing, maybe the slow pressure recovery time is messing with things, making it hard to get up to speed properly with the pedal to the floor. The pump was pumping, but it couldn't recover fast enough.Īfter removing the gauge due to rain, I drove up to 55mph for about a mile, and it seemed to slowly speed up to that point after I had basically picked about 50 (when I let off the throttle a bit) as if the pressure was recovering still for quite some time, changing timing and therefore still increasing throttle slightly. That makes me think of a YouTube video i saw about a certain Facet duralift pump dropping it's fuel level so much on an idi vs another model duralift. I do notice something in the video when cruising at 45, the pressure appears to be slowly recovering, as if it dropped because it couldn't keep up and the pump it taking a long time to recover.
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