Just cranks forever without starting...

alanc1100 · May 17, 2019

Hi all, new here. My 08 with 5.7 Hemi decided it won't start. 130,455 miles. Just changed oil. Sat for two days, then when trying to start, it just keeps cranking and not starting until I turn the key off. Changed throttle body, crankshaft sensor, IAT sensor, ignition switch module and nothing helped. I sprayed starting fluid in the intake and she'll fire up for a sec just on the fluid. So, I know I've got spark and air, just no fuel. So, I suspect bad fuel pump. Anyone got a way to check the fuel pump without taking the tank out?

Thanks, Alan

OhioGuy36 · May 18, 2019

It was fuel pump for me. Better be prepared for the lockring tabs on gas tank to break when taking lock ring off(making the tank unusable unless you put bolts and washers through it) used salvage tanks are usually just as bad. A new tank is 900$
So oil the lockring and tabs super good with 3 in 1 oil(NOT WD40) wait a while and oil again and lightly tap the lockring off after dropping the tank or removing the bed.

Sent from my SM-G975U using Tapatalk

smithwessn · May 18, 2019

OhioGuy36 said:
It was fuel pump for me. Better be prepared for the lockring tabs on gas tank to break when taking lock ring off(making the tank unusable unless you put bolts and washers through it) used salvage tanks are usually just as bad. A new tank is 900$
So oil the lockring and tabs super good with 3 in 1 oil(NOT WD40) wait a while and oil again and lightly tap the lockring off after dropping the tank or removing the bed.

Sent from my SM-G975U using Tapatalk

Why not WD40? Just curious.

Johnsram · May 18, 2019

smithwessn said:
Why not WD40? Just curious.

There are far better penetrating oils and lubricants. WD40 is almost the bottom of the line. They are only familiar to so many because of good advertising.

smithwessn · May 18, 2019

Gotcha

Arth · May 18, 2019

alanc1100 said:
Hi all, new here. My 08 with 5.7 Hemi decided it won't start. 130,455 miles. Just changed oil. Sat for two days, then when trying to start, it just keeps cranking and not starting until I turn the key off. Changed throttle body, crankshaft sensor, IAT sensor, ignition switch module and nothing helped. I sprayed starting fluid in the intake and she'll fire up for a sec just on the fluid. So, I know I've got spark and air, just no fuel. So, I suspect bad fuel pump. Anyone got a way to check the fuel pump without taking the tank out?

Thanks, Alan

Simple check is to turn the key to run and listen for the fuel pump to prime. Leave the driver door open and listen for that sound. If you don't hear it then fuel pump is possibly it.

Another check or two you can do is check fuel rail pressure when you turn the key is on and check the fuel pump fuse.

Jason G Slabaugh · May 19, 2019

Or get a fuel pressure gauge and connect it to the rail, Auto Zone may rent you one

Just cranks forever without starting...

alanc1100

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OhioGuy36

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smithwessn

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Johnsram

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smithwessn

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Arth

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Jason G Slabaugh

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