Is it normal for fuel pressure to bleed off?
Is it normal for fuel pressure to bleed off? It is normal for the pressure to bleed off over time (several minutes). The fuel pump usually has a check valve in the outlet to keep the line pressurized. What is REST fuel pressure? To prevent fuel percolation and aid hot- and cold-engine starting, fuel injection systems must maintain residual, or "rest," pressure when the engine is off. All systems lose residual pressure over time. The fuel pump's internal check valve may be allowing residual pressure to leak into the fuel tank. What does it mean when fuel pressure bleeds off?...