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Old 06-19-2014, 06:34 PM
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Long cranking period?!

I the last few days my 04 TJ 4.0 has been taking a long time to crank over like 5-6 seconds. it's normally when I get up to go to work and when I get off, so when it's sitting for an extended period of time. Anyone have an similar experiences or know any fixes?

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Old 06-19-2014, 06:36 PM   #2
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Fuel pump check valve allowing rail pressure to bleed away

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Old 06-19-2014, 06:41 PM   #3
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I have the same problem, what I have been told is exactly what Digger said. However, if you turn your key to the on position and wait five seconds and then repeat once or twice it should start right up. Someone told me you could go for years like that without replacing the fuel pump/ fuel regulator/ check valve, which in my research costs about $700 to have someone swap it out.
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Old 06-19-2014, 09:11 PM   #4
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Quote:
Originally Posted by Digger84 View Post
Fuel pump check valve allowing rail pressure to bleed away
X2

Key on and off a couple of times as Mecklund said. If it starts right up that is most likely your problem.
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Old 06-19-2014, 09:14 PM   #5
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Replace your fuel pump and fuel pressure regulator. That problem is caused by a leaky check valve allowing fuel to drain down out of the engine and back into the gas tank if it sits long enough.
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Old 06-20-2014, 04:30 AM
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Replace your fuel pump and fuel pressure regulator. That problem is caused by a leaky check valve allowing fuel to drain down out of the engine and back into the gas tank if it sits long enough.
is there any issues it will cause if I let it go for a little bit Til I get around to fixing it I work construction and am on the road a lot and don't wanna be left sitting somewhere
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Old 06-20-2014, 07:55 AM   #7
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Won't cause new damage that a new pump filter valve unit won't fix but may eventually leave you stranded if gets leaky enough pump cannot keep pressure adequate for running

Could probably wait quite a while
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Old 06-20-2014, 08:14 AM   #8
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is there any issues it will cause if I let it go for a little bit Til I get around to fixing it I work construction and am on the road a lot and don't wanna be left sitting somewhere
In most cases, the problem is with a dime-sized rubber seal in the pressure relief valve, which is the primary component of the fuel pressure regulator. Due to the nature of the valve, a slight static leak won't have much affect on its actual operation, where is "leaks" (returns fuel) in a major way, by design.

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