Nissan 370Z Forum - View Single Post - Starter cranks for 5-10 seconds?

TBatt · 12-09-2016, 09:32 AM

I'm thinking that you have a fuel system problem. It may be that the new fuel pump is also bad. Crap like that has happened before. If the fuel pump regulator is bad (integrated into the fuel pump assembly) it will let the fuel pressure drop to zero. When you try to start the car the fuel pump gets a short burst of power and then waits until the engine is being turned by the starter then it goes to full run mode. So while the engine is spinning over the fuel pump is running and trying to build pressure but the engine is consuming fuel to try and start. Eventually the fuel pump will catch up and the engine will start. Two problems that can cause this is a bad check valve or a bad regulator. Installing a fuel pressure gauge will test this. The pressure in the fuel system should be around 50-53 PSI and should remain at that level for days after the engine has been shut off. Nissan should be able to test this.

12-09-2016, 09:32 AM	#20 (permalink)
TBatt Track Member Join Date: Apr 2013 Location: Huntsville, AL Posts: 832 Drives: 2019 GT-R Rep Power: 20168	I'm thinking that you have a fuel system problem. It may be that the new fuel pump is also bad. Crap like that has happened before. If the fuel pump regulator is bad (integrated into the fuel pump assembly) it will let the fuel pressure drop to zero. When you try to start the car the fuel pump gets a short burst of power and then waits until the engine is being turned by the starter then it goes to full run mode. So while the engine is spinning over the fuel pump is running and trying to build pressure but the engine is consuming fuel to try and start. Eventually the fuel pump will catch up and the engine will start. Two problems that can cause this is a bad check valve or a bad regulator. Installing a fuel pressure gauge will test this. The pressure in the fuel system should be around 50-53 PSI and should remain at that level for days after the engine has been shut off. Nissan should be able to test this. __________________ RJM pedal, Hotchkis Sway Bars, FI TDX, FOG Light, Z1 Slotted Drilled rotors, Stillen SC, Quaife ATB, Z1 Oil cooler, AEM Gauge Set, Galeforce gauge mount, Avant Garde M590 Hypersilver w/RE-11, TopgunZ A2A kit., ECUtek tuned by Seb: ROLL TIDE!