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Fuel pressure, will not stay running

Tiny
PACIFICISLANDER
  • MEMBER
  • 1996 NISSAN HARDBODY
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
Need to know the fuel pressure on this truck, furthermore it start a few seconds then shuts off. Ignition is good sparks all around but still shuts off a few seconds. If the cam and crank not align will it be able to start then shuts off later or it wont start all

The fuel pressure reading I'm getting is about 33psi I thought it was suppose to be between 60-80 psi on this truck-Please let me know-Thank You
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Sunday, February 9th, 2020 AT 11:26 PM

14 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

Pressure at idle should be at 34, so you are right on target. Here are the directions for testing. The pics attached correlate with the pics. Just making sure you did it how the manual says to do it.

________________________

1996 Nissan-Datsun Truck D21 Hardbody 2WD L4-2389cc 2.4L SOHC MFI (KA24E)
Fuel Pressure Test
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Testing and Inspection Component Tests and General Diagnostics Fuel Pressure Test
FUEL PRESSURE TEST
FUEL PRESSURE CHECK

NOTE:
a. When reconnecting fuel line, always use new clamps.
B. Make sure that clamp screw does not contact adjacent parts.
C. Use a torque driver to tighten clamps.
D. Use Pressure Gauge to check fuel pressure.

1. Release fuel pressure to zero.
2. Disconnect fuel hose between fuel filter and fuel tube (engine side).

Pic 1

3. Install pressure gauge between fuel filter and fuel tube.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.

At idling:
Approximately 235 kPa (2.4 kg/cm2, 34 psi)
A few seconds after ignition switch is turned OFF to ON:
Approximately 294 kPa (3.0 kg/cm2, 43 psi)

6. Stop engine and disconnect fuel pressure regulator vacuum hose from intake manifold.

Pic 2

7. Plug intake manifold with a rubber cap.
8. Connect variable vacuum source to fuel pressure regulator.

Vacuum/fuel Pressure Test

Pic 3

9. Start engine and read indication of fuel pressure gauge as vacuum is changed.

Fuel pressure should decrease as vacuum increases. If results are unsatisfactory, replace fuel pressure regulator.

____________________________________
Now, has anyone installed a security system in the vehicle? Are there any diagnostic trouble codes stored? As far as the timing, if it starts, even if out of time, I would think you would be able to keep it running.

Let me know. Also, if you have a live data scanner, let me know that as well. A stalling after being started can be many things. Even a plugged catalytic converter.

Joe
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Monday, February 10th, 2020 AT 3:04 PM
Tiny
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  • 240 POSTS
Put pressure gauge straight to the incoming line and got 34psi with KOEO then find out injectors are partially clogged, change it tried to starts a few times on its own but unable to maintain idle. Perhaps IACV and TPS needs further adjustment.I will let you know later when I'm done.

Joe
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Tuesday, February 11th, 2020 AT 12:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Sounds good. Let me know if you need anything.

Take care,
Joe

PS: Did you once work here?
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Tuesday, February 11th, 2020 AT 8:07 PM
Tiny
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Why do you ask, of course Joe I was just working right besides you all those years-BTW. We went a long ways for that anti-theft problem and we nail it just didn't come back to tell you. Thank you
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Tuesday, February 11th, 2020 AT 9:41 PM
Tiny
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Now it fires then shuts off. Back and forth continuously. Don't know what's going on. Checked MAF it's okay. What do you think?
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Wednesday, February 12th, 2020 AT 12:40 AM
Tiny
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If it's not on compression stroke both cam and crank alignment set to specs will it be able start and shuts off. This is what it's doing. I think it has to do with fuel issue or the throttle body is bad.
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Wednesday, February 12th, 2020 AT 1:44 PM
Tiny
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  • MECHANIC
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If you have everything set to spec, it should continue running unless you lose spark or fuel. Or, if someone has installed an anti theft system.

By the way, how the heck are you? I miss working with you. As far as the prior anti theft, was that a Mitsubishi? What was the final fix?

Joe
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Wednesday, February 12th, 2020 AT 4:37 PM
Tiny
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It was a 2008 Mitsubishi Outlander it was one heck of a nightmare but without your help I don't think I can find it, it was the MPI relay and PCM. Hey I'll let you know the turn out on it-Goodbye Joe
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Wednesday, February 12th, 2020 AT 8:38 PM
Tiny
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Joe, can you verify the rotation of the distributor one reference from here has the distributor turning clockwise the other is c/clockwise? I'm getting confuse here don't know which to follow.
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Wednesday, February 12th, 2020 AT 8:54 PM
Tiny
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That isn't listed in the manuals, but it should be clockwise. Can you crank it to confirm?
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Wednesday, February 12th, 2020 AT 9:13 PM
Tiny
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Joe, this one it's moving c/clockwise. This is how it's turning when cranking:
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Wednesday, February 12th, 2020 AT 9:24 PM
Tiny
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Glad you found that. I honestly thought it was clockwise.
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Thursday, February 13th, 2020 AT 6:48 PM
Tiny
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This went a goose chase it was the throttle body that was doing it. It was leaking gas on the vacuum line input going to the EGR valve. Thanks! Joe
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Friday, February 14th, 2020 AT 7:11 PM
Tiny
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That's a new one. LOL I'm glad you got it taken care of. You always seem to get some interesting problems. LOL

Take care of yourself and stay in touch.

Joe
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Friday, February 14th, 2020 AT 8:20 PM

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