QuestionWhat should the fuel line pressure be about on a 2004 Nissan Titan?
AnswerGlen,
From http://www.titantalk.com/forums/titan-general-discussion/78480-fuel-line-questio... the following is what it should read and the process. Also, nissan-techinfo.com is the source to get the factory service manual and other factory info.
--------------------------------------------------------------------------------
FUEL PRESSURE CHECK
CAUTION:
● Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.
● Be careful not to scratch or get the fuel hose connection area dirty when servicing, so that the
quick connector o-ring maintains sealability.
● Use Fuel Pressure Gauge Kit J-44321 and Fuel Pressure Adapter J-44321-6 to check fuel pressure.
● Do not perform fuel pressure check with electrical system operating (i.e. lights, rear defog, A/C,
etc.). Fuel pressure gauge may indicate false readings due to varying engine loads and changes in
manifold vacuum.
NOTE:
Prepare pans or saucers under the disconnected fuel line because the fuel may spill out. The fuel pressure
cannot be completely released because A60 models do not have fuel return system.
1. Release fuel pressure to zero. Refer to EC-87, "FUEL PRESSURE RELEASE" .
2. Remove engine cover.
3. Remove fuel hose using Quick Connector Release J-45488. Refer to EM-17, "INTAKE MANIFOLD" .
● Do not twist or kink fuel hose because it is plastic hose.
● Do not remove fuel hose from quick connector.
● Keep fuel hose connections clean.
4. Install Fuel Pressure Adapter J-44321-6 and Fuel Pressure
Gauge (from kit J-44321) as shown in figure.
● Do not distort or bend fuel rail tube when installing fuel pressure
gauge adapter.
● When reconnecting fuel hose, check the original fuel hose for
damage and abnormality.
5. Turn ignition switch ON (reactivate fuel pump), and check for
fuel leakage.
6. Start engine and check for fuel leakage.
7. Read the indication of fuel pressure gauge.
● During fuel pressure check, check for fuel leakage from fuel
connection every 3 minutes.
At idling: Approximately 350 kPa (3.57 kg/cm2 , 51 psi)
8. If result is unsatisfactory, go to next step.
9. 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.
10. Before disconnecting Fuel Pressure Gauge and Fuel Pressure Adapter J-44321-6, release fuel pressure
to zero. Refer to EC-87, "FUEL PRESSURE RELEASE" .
This was from the service manual. It doesn't address many of your other questions. It does show how to disconnect the lines. I downloaded the service manual from http://www.nissan-techinfo.com
