Background: I've done the normal in-tank mods and have an AirDog feeding the OE fuel pump into an ITP regulated return system. Fuel pressure is monitored through a DiPricol Optix gauge
Today I just started noticing that fuel pressure in a steady-throttle condition (cruising down the interstate) was fluctuating between 60-70 psi when before it had been rock-steady at 64 psi. Since Dennis @ ITP has assured me the only part that could really go bad in his RR kits is the diaphragm and that is VERY unlikely to happen, what could be the cause of my wobbly fuel pressure? I'm almost positive it's not a lack of supply (new primary and AD filters 2K miles ago) and since fuel isn't spewing out the boost reference port on the regulator, could the flaky pressure be a sign of the main pump going bad?
Today I just started noticing that fuel pressure in a steady-throttle condition (cruising down the interstate) was fluctuating between 60-70 psi when before it had been rock-steady at 64 psi. Since Dennis @ ITP has assured me the only part that could really go bad in his RR kits is the diaphragm and that is VERY unlikely to happen, what could be the cause of my wobbly fuel pressure? I'm almost positive it's not a lack of supply (new primary and AD filters 2K miles ago) and since fuel isn't spewing out the boost reference port on the regulator, could the flaky pressure be a sign of the main pump going bad?