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Hi all, I was next to my car the other day and I could hear the fuel pump coming on and off intermittently. Is this normal activity for a fuel pump? Aren't they supposed to always be running?

This sound was coming from passenger side, right in front of the rear wheel.

Thanks,
Jason
 

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Hi all, I was next to my car the other day and I could hear the fuel pump coming on and off intermittently. Is this normal activity for a fuel pump? Aren't they supposed to always be running?

This sound was coming from passenger side, right in front of the rear wheel.

Thanks,
Jason
In short, yes. The fuel pump and FPR (Fuel Pressure Regulator) are trying to maintain a constant fuel rail pressure of ~51psi. Since Nissan chose to go with a non-return based fuel injection system, at low RPM conditions the fuel pump must cycle to maintain the pressure.

In a fuel return based system (most modern EFI) the pump runs constantly and the FPR restricts or relaxes fuel flow to maintain a constant pressure.

Regards,
Ronin Z
 
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