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Fuel pressure

Tiny
JPUTNAM
  • MEMBER
  • 1998 DODGE DURANGO
  • 5.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 153,000 MILES
I checked my fuel pressure with a gauge and after turning the switch on a off about six or seven times it held at 44 psi. I could not check it at idle because the engine will not fire up. Should I have to do that to get the pressure up or should it come up on one or two tries?
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Monday, May 21st, 2018 AT 9:39 AM

9 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
It should be 44 psi the very first time.
If you have 44 psi even after seven tries, and it still will not start you may be either missing fuel injector voltage and/or pulse or no ignition spark. So start by checking the fuel injector fuse/s and for a spark or see if the engine will start and run for a few seconds with some starting fluid, if so then you know it has spark.
The fuel injectors are powered from fuse #3 in the PDC and a auto shutdown relay, to same PDC. That also feeds the ignition coil.
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Monday, May 21st, 2018 AT 9:44 AM
Tiny
JPUTNAM
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  • 28 POSTS
Okay, I put my battery charger on until it had a full charge and it fired right up. Now before I charged the battery it was turning over fine. I do no like it when it does that. Now I do not know if it was just low voltage or what.
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Monday, May 21st, 2018 AT 11:17 AM
Tiny
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Could have been a loose connection. Check the battery cables ends at both ends by twisting real hard and if they move at all, they are too loose.
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Monday, May 21st, 2018 AT 11:19 AM
Tiny
JPUTNAM
  • MEMBER
  • 28 POSTS
Just when out to crank it up to check the alternator and guess what, it turned over good but did not fire up.
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Monday, May 21st, 2018 AT 11:45 AM
Tiny
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  • MECHANIC
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Okay, recheck everything, fuel pressure, spark, etc. Try some starting fluid too that can substitute for the entire fuel system so if it starts and runs a few seconds, then you know it has spark if not. Check for voltage to fuel injectors with key on run and then a pulse while cranking.
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Monday, May 21st, 2018 AT 12:29 PM
Tiny
JPUTNAM
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  • 28 POSTS
What are the resistance specifications for the coil on my vehicle?
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Wednesday, May 23rd, 2018 AT 6:37 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
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Coil Manufacturer = Diamond
Primary Resistance = 0.96 - 1.18 ohms
Secondary Resistance @ 70°- 80°F = 11,300 - 15,300 ohms

Coil Manufacturer = Toyodenso
Primary Resistance = 0.95 - 1.20 ohms
Secondary Resistance @ 70°- 80°F = 11,300 - 13,300 ohms
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Wednesday, May 23rd, 2018 AT 7:03 AM
Tiny
JPUTNAM
  • MEMBER
  • 28 POSTS
When I check the primary resistance do I put my meter on 20k?
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Wednesday, May 23rd, 2018 AT 7:18 AM
Tiny
PATENTED_REPAIR_PRO
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No, use a scale closer to the 1 ohm scale, since that is the reading you are looking for. 20k is 20,000 ohms, way too much.
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Wednesday, May 23rd, 2018 AT 7:20 AM

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