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Cranks no start after checking fuel pressure.

Jm2576

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I checked my fuel pressure with a new gauge I just bought but after using it my truck won't start. It ran fine before so im wondering if I bumped something or if there is some sort of safety device that engaged preventing it from starting. When I turn the key I can hear the fuel pump engage. Also if I press the schrader valve gas will squirt out.

Also, the first time I tried to hook up the pressure gauge I didn't have it threaded very tight and gas spilled out. Maybe that triggered something?

It's for a 2000 4.0 engine
 


alwaysFlOoReD

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Turn the key on then off 3 or 4 times, with out starting the engine. You may have released the pressure. Each time you turn the key the pump runs for 2 seconds and builds up 10 lbs pressure. For a 1997 and earlier you need at least 30 to start. 40 is spec. For 98 and up 70? is spec...
 

RonD

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No, no safety device

As said try cycling the key on and off a few times

Coil pack is in that general area, make sure its 4 wire connector is tight
 

Jm2576

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Thanks. Finally got it started. Had to cycle the key like 6 or 7 times. Usually it would only take a couple. I checked my fuel pressure and it starts out at around 55 but quickly drops. Now to track down that cause. It seems to run fine other than that. But I am getting a lean trouble code.
 

RonD

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If you don't smell gasoline then the only place you can lose fuel pressure on a 1998 and up is in the gas tank
The Fuel pump and the Fuel Pressure Regulator(FPR) are both on the assembly in the gas tank

As said 55-65psi is spec for 1998 and up Rangers
15-20psi less will set Lean Codes while running
 

Jm2576

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When I turn on the key the pressure reads ~50 then slowly drops to 35, but holds there. When the engine is running the pressure is 65. Also I don't know if my gauge is working properly. I got it from Amazon and the o-ring is all chewed up on one of the connector fittings.
 

RonD

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Those pressure numbers are fine
 

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