Crank no start issue

  • 2003 INFINITI I35
  • 6 CYL
  • 4WD
  • 167,000 MILES
My car won’t start it will crank but not turn over. I was wondering if it were possible if it could be caused by the fuel pump?
Do you
have the same problem?
Friday, April 26th, 2019 AT 11:12 AM

1 Reply

Welcome to 2CarPros.

For an engine to run, it needs compression, spark to the plugs, and fuel. Also, timing must be correct. So to answer your question, yes, the pump may have failed.

Now, I am going to provide a link for a crank no start condition. Look through that first and let me know if it helps.

If you feel comfortable performing the test, here is a link showing how to check for spark:

Here is a link that shows how to check fuel pressure:


Here are the specific directions for your vehicle for testing fuel pressure. The attached pictures correlate with the directions.

Fuel Pressure Check
- When reconnecting fuel line, always use new clamps.
- Make sure that clamp screw does not contact adjacent parts.
- Use a torque driver to tighten clamps.
- Use Pressure Gauge to check fuel pressure.

1. Release fuel pressure to zero.

picture 1

2. Disconnect fuel tube joint between fuel damper and injector tube and set fuel pressure check adapter (J44321).

picture 2

3. Install pressure gauge to the fuel pressure check adapter as shown in the figure.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.

At idling: Approximately 350 kPa (3.57 kg/, 51 psi)

6. If results are unsatisfactory, go to next step.
7. Check the following.
- Fuel hoses and fuel tubes for clogging
- Fuel filter for clogging
- Fuel pump
- Fuel pressure regulator for clogging
If OK, replace fuel pressure regulator.
If NG, repair or replace.


If you find the fuel pump is bad, here are the directions for replacing it. Also, these directions include info for the filter, too. I would recommend replacing it at the same time.

Fuel Pump, Fuel Level Sensor Unit And Fuel Filter

Picture 3


picture 4

1. Release fuel pressure from fuel line.
Refer to "Fuel Pressure Release".
2. Remove rear seat bottom.
3. Remove inspection hole cover located under the rear seat.
4. Disconnect electrical connector.
5. Disconnect the quick connectors.
- For disconnection of quick connectors, refer to step 6. of "Fuel Tank Removal".

6. Remove the six bolts.

picture 5

7. Pull out the fuel level sensor unit and fuel pump.
- Do not damage the arm of the fuel level sensor and fuel tank temperature sensor.

picture 6

8. Remove flange of fuel level sensor unit and fuel pump.
- Using a screwdriver, remove the snap fit portion as shown in the figure.

picture 7

9. Push fuel level sensor flange.
- Using a screwdriver, remove the snap fit portion as shown in the figure.

10. Pull up the fuel level sensor.

picture 8

11. Remove fuel filter from pump bracket.
- Using a screwdriver, remove the snap fit portion as shown in the figure.

12. Remove pressure regulator clip, then pull out pressure regulator.

picture 9

13. Remove fuel pump, then push down the fuel pump as shown in the figure.
14. Remove packing from fuel pump.

picture 10

15. Remove the pump support rubber from the fuel pump.

Install in the reverse order of removal paying attention to the following.
- Install the fuel filter and fuel pump with the tabs aligned, make sure a click sound of secure engagement is heard.
- Securely connect the harness connector of the fuel pump.
- Install the pressure regulator O-ring as follows.

- When replacing, always use a new O-ring, packing and clip.
- Handle it with bare hands. (Do not use gloves.)
- Visually check the O-ring, mounting parts and mating parts for foreign materials and flaws.
- Before installing, apply new engine oil.
- To avoid damage, do not apply an excessive force (pulling or starching).

Fuel Pressure Regulator

picture 11

- Install the pressure regulator as follows.
a. Insert the clip to the groove of the regulator.
b. With the clip installed, insert the regulator straight by matching the fuel filter protrusion and the clip notch.
c. Make sure that the fuel filter protrusion and clip notch are securely engaged.

picture 12

- Install retainer so that its notch becomes parallel with notch on fuel tank.
- Tighten retainer mounting bolts evenly.


I know this seems like a lot, but it really isn't that bad to do. You are lucky because the fuel tank doesn't need removed to access the pump.

Let me know if you have other questions or need help.

Take care,
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Saturday, April 27th, 2019 AT 8:35 PM

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