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Emergency fuel cutoff switch?


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Old 01-02-2017, 12:38 PM   #1 (permalink)
 
kdryan's Avatar
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Ram Year: 1998
Engine: 5.2
Default Emergency fuel cutoff switch?
So my '98 Ram 5.2 stopped running in the middle of the road on Christmas eve. It's getting spark, but not fuel. I sprayed some starter fluid into the intake and it started, so it's not getting fuel. I replaced the relay and the fuse looks okay, so I am thinking fuel pump. If it is, it's going to sit until spring because I am NOT going out there in 30 weather to drop that tank! Before I set it aside for the winter though I wondered i there was an emergency fuel cutoff switch somewhere. I know I ran into that on my Mustang and an old Grand Marquis I used to have so I thought it might have one...

Any thoughts or advice on doing this job?


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Old 01-02-2017, 12:57 PM   #2 (permalink)
 
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Ram Year: 2013
Engine: 5.7 HEMI
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when you turn the key to "on", can you hear the fuel pump come on momentarily?
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Old 01-02-2017, 03:14 PM   #3 (permalink)
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Ram Year: 2001 1500 Sport with 3/4 ton spring pack
Engine: Magnum 360
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Fuel cutoff is controlled by the PCM through the ASD relay. I believe the ASD relay also cuts off power to the ignition coil. If you want to check and the problem still persists, in the underhood fuse block, swap the A/C compressor clutch relay and the ASD relay, they should be the same type.

Otherwise, your problem may be lack of fuel pressure from either a bad pump, or a bad pressure regulator. An easy way to check is to rent a fuel pressure test kit from a place like autozone and test fuel pressure at the fuel fail by the TB.
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Old 01-02-2017, 04:08 PM   #4 (permalink)
 
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Engine: 5.2
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Got a new relay since there are about a dozen of the same thing on the truck. I figured if no joy, I would have a spare. No joy... Don't hear the fuel pump...
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