Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

long cranking??

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Old Nov 10, 2006 | 10:21 PM
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sleepersilverado's Avatar
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Default long cranking??

so i have always wondered what causes older vehicles to take longer to crank. my truck is a 2000 with about 90k miles on it and within the last year my truck has to be cranked/turned over longer before it starts.

what causes this???

i was thinking something in the fuel system. like the system is bleeding down and you are having to re prime and redeliver the fuel to the rails, there for that is why it is taking longer to start cuz it is starving for fuel.

so what is the answer?
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Old Nov 10, 2006 | 10:34 PM
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GOaT Cheese's Avatar
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Originally Posted by sleepersilverado
so i have always wondered what causes older vehicles to take longer to crank. my truck is a 2000 with about 90k miles on it and within the last year my truck has to be cranked/turned over longer before it starts.

what causes this???

i was thinking something in the fuel system. like the system is bleeding down and you are having to re prime and redeliver the fuel to the rails, there for that is why it is taking longer to start cuz it is starving for fuel.

so what is the answer?
You got it, usually the anti-drain back check valve in the fuel pump goes bad, and all the fuel runs out of the lines. Or on rare occasions, if it only does it when the truck is warmed up, it could be the fuel pressure regulator leaking into the intake.
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Old Nov 10, 2006 | 11:39 PM
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Pull the vacuum line off the pressure regulator on the fuel rail after it sits for a while and see if it has fuel in it. Lots of problems with the pr's on truck's especially in those year models. By 02 they had it taken care of for the most part.
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Old Nov 11, 2006 | 12:24 AM
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Default cam sensor

A faulty cam sensor can also cause an extended crank time also.
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Old Nov 12, 2006 | 02:58 PM
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sweet
yea i always thought it was injectors leaking down or the pump. i also forgot about the pressure regulator on the trucks suck thanks for the reminder.
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