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Engine runs fine have only limited pressure weak

Engine runs fine have only limited pressure weak and intermitent

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Check to see what your inlet pressure is. If your inlet pressure is lower than what is recommended, the pump will put out more than it is getting into it. Also check to see if it has an inlet screen. If it does, it may be plugged up, & need cleaning. The only other thing would be the pump itself is worn out, or has something jammed in the impeller, not knowing how old it is.

Posted on Jul 11, 2010

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Posted on Jan 02, 2017

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What is Pc171 Code


It's P0171 & P0174 not Pc 171 & Pc174 ! The engine computer has detected a lean condition ! That mean's it's not getting enough fuel or has a vacuum leak , bad O2 sensor ! fuel pump getting weak . fuel pressure regulator weak !
P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. Air Measurement System
  • MAF sensor (contaminated, damaged, malfunctioning, etc.)
Fuel System
  • Fuel pressure regulator (leaking, malfunctioning, etc.).
  • Fuel filter plugged, dirty.
  • Fuel pump (weak, check valve leaking, etc.).
  • Leaking/contaminated fuel injectors.
  • Low fuel pressure or running out of fuel.
  • EVAP canister purge valve leaking (when canister is "clean").
  • Fuel supply line restricted.
  • Fuel rail pressure sensor (incorrect reading).
Air Induction System
  • Air leaks after the MAF.
  • Vacuum Leaks.
  • PCV system (leak, valve stuck open, etc.)
  • Improperly seated engine oil dipstick.
Exhaust System
  • Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).
EGR System
  • EGR valve tube/gasket leak
  • EVR solenoid vacuum leak
Secondary Air Injection
  • Damaged/malfunctioning secondary air injection system (mechanically stuck valve).
  • P0174 - System to Lean (Bank 2) The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. See Possible Causes for DTC P0171. See Diagnostic Aides for DTC P0171
View Freeze Frame Data to determine operating conditions when DTC was set. Observe LONGFT1 and 2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.

Feb 12, 2015 | 2002 Ford Escape

1 Answer

Fuel not getting to engine


Service your fuel system. This will include but not limited to:
  • Fuel filter clogged
  • Fuel pump relay faulty
  • Fuel pump weak or faulty, (yes they can run but not hold pressure)
  • Fuel pressure regulator (if so equipped)

Dec 05, 2013 | 1998 GMC Sierra

1 Answer

Engine wont start, has spark, fuel pump comes on


Clogged filter, NOTE: sometimes a fuel pump will run, but is still too weak to run an engine properly. You can go ahead and replace the pump and then rule it out as being bad, or check the fuel pressure and see if it is within the proper limits.

Dec 05, 2013 | 1997 Mercury Villager

1 Answer

2006 monte carlo wont start without priming


sounds like your fuel pump weak, need to check fuel pressure when engine won;t start and check with engine running

Sep 03, 2012 | 2006 Chevrolet Monte Carlo

1 Answer

Have to spray starter fluid in the intake to get to start. once started runs fine, why?


This sounds like a weak fuelpump, and take a while to build up pressure, the starting fluid get the engine running until the pump builds up pressure, i would have the fuel pressure tested and i think you will find that its bad. good day.

Jun 19, 2011 | 1996 Ford Explorer

2 Answers

06 Mustang V6 5sp stalls intermitantly hard to restart any ideas? no check engine light becoming more frequent.


Gonna give you a list of items that I've come accross with this vehicle same problem.
Hope it helps!
EGR stuck open
battery and cables ( weak and corrosion)
Fuel pressure regulator (stuck open)
PCV valve defective
Fuel pump defective check ball ( little to no residual pressure)

May 10, 2010 | 2006 Ford Mustang

1 Answer

I have an Audi A4 2001 2.0 lt. the engin management system keeps flashing. i did a full service at Audi but did not solve the problem, the cars runs fine and starts fine. when the car is still i could feel...


when the eml lght flashes it is normally detecting a missfire but could be an intermitant missfire as vw's also do this

you need to have the car read with a diagnostic computer

hope this helps

svs
07923 479640

Jun 13, 2009 | 2001 Audi A4

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