I'm getting a p0087 on a hard acel new low preasure pump new fuel filters run the pinpoint test in the pced is fine and passes the high preasure test with the ids? not sure where to go from here any one elses seen this?

 

Potential causes of a P0087 trouble code may include: Weak fuel pump, clogged filter or screen, restricted fuel supply line Faulty fuel pump driver module Faulty fuel pressure sensor

 

If vehicle is equipped with a fuel pressure test port at the fuel rail or line, check fuel pressure using a mechanical pressure gauge to determine if it is within specifications. Fuel pressure should also be tested under load with vehicle in gear or during acceleration. If fuel pressure is below spefications, visually inspect all fuel lines going back to the tank to see if there is a restriction such as a bent fuel line. Fuel filter may be clogged if it has not been changed for a long time, or the in-tank fuel screen may have become restricted or clogged - check for damage to the fuel tank that could cause the bottom of the tank to press up against the fuel pump inlet. Fuel pump driver module equipped vehicles are usually operated on a PWM (Pulse width modulated) input signal from the PCM/ECM and a PWM output signal to the fuel pump, in other words they run on a duty cycle - which is a voltage on/off time rather than a constant voltage to regulate the pump speed. The PWM signal can be checked at the driver module using a wiring diagram for reference and a DVOM set to duty cycle with the positive lead on the signal wire and the negative lead on a good known ground. The duty cycle should vary according to fuel pump demand commanded by the PCM/ECM. Some vehicles such as Ford will double the duty cycle output, so a 30% input will result in a 60% output to the fuel pump. The duty cycle to the fuel pump should reflect this increase. This voltage is usually monitored by the PCM and may set an additional fault code if there is a problem with the fuel pump driver module. Fuel pressure sensor can be checked using a wiring diagram for reference and DVOM. Typically there is a reference voltage power or ground wire that is monitored by the PCM. A problem with the power or ground wire would typically set a different code such as P0190 - Fuel rail pressure sensor circuit malfunction, or P0191 - Fuel rail pressure sensor circuit range/performance. Excessive resistance in the sensor or wiring leads may lead to an incorrect reading. Using the DVOM set to ohms scale, check the resistance of the pressure sensor by unplugging the sensor and attaching the positive and negative leads to the sensor connector. If the resistance is higher than specifications, replace the sensor. The wiring can be tested using the DVOM set to ohms as well by disconnecting the sensor and the PCM and checking for excessive resistance between the two terminal ends of the wiring harnesses with the positive lead of the DVOM on one end and the negative lead on the other end of the same wire.

 

do you have a preasure gage that reads 29,000 psi I shure don't its a 6.7 powerstroke.

 

As stated the low pressure fuel system must be working within specification and tested preferably under load. Though you state the pump and filters are new you really need to verify the fuel lift pump pressure. Typical supply pressure readings hover around 55 PSI.

Otherwise, DTC P0087 means that the PCM is unable to achieve/maintain the commanded high pressure fuel rail pressure. Beyond performing the normal IDS and pinpoint tests the system will need to be inspected for contamination that will indicate debris or damage that will affect the performance of the high pressure pump, pressure regulator and volume regulator.

On that note, remove fuse F33 in the battery Junction Box (and fuse F37 for good measure) and inspect for signs of arcing on the fuse blades and to see if the fuse is open. There is a known concern involving this fuse I have come across two trucks with this concern. Usually simply removing and reinstalling the fuse can correct the condition.


Incorrect... where the 2011-2016 Super Duty 6.7L is concerned. The low pressure fuel supply pump is not powered or controlled by a Fuel Pump Control Module. The pump is powered by a relay that is commanded on 100% when the engine is running. However, during certain driving conditions the PCM cycles the fuel pump on and off for testing purposes and is considered normal operation. Low pressure fuel is not actively regulated either. The supply system works within a pressure range and is limited only by a regulator built into the Fuel conditioning module that limits pressure to 120 PSI.

 

Not on the ford but on the Passat. We had the restriction in the filter. It was VW Passat TDI went to the dealer four times for low fuel pressure would not start after a filter change. So at the fifth time I replaced the engine mounted filter and the problem went away. I did not get reimbursed for the filter but it saved me a trip.

You both know allot more then me.