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tricking the fuel pump control module Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Tricks of the Trade TheGrinder(ofgears) User Dec 30, 2022, 11:36 PM Post #1 of 4 (5967 views) tricking the fuel pump control module Sign In apparently, to control the fuel pump, the fuel pump control module (PEM on a volvo) takes a Pulse Width Modulation signal from the ECU as input and then drives the fuel pump in proportion to the duty cycle of the signal. As the fuel pump ages, it often takes a higher and higher duty cycle to maintain enough fuel pressure to keep the fuel pressure sensor happy. Is this PWM signal +12V? Is continuous operation of the pump engaged only at 100% duty cycle or instead at some lower percentage? is patching a continuous voltage (of, say 12V if that's the signal level) equivalent to a 100% duty cycle? Is doing so to operate the PEM and pump for purposes of emptying the tank through the fuel rail likely to damage either? 2012 Volvo S60 T5 (This post was edited by TheGrinder(ofgears) on Dec 30, 2022, 11:37 PM) Tom Greenleaf Ultimate Carjunky / Moderator Dec 31, 2022, 1:53 AM Post #2 of 4 (5960 views) Re: tricking the fuel pump control module Sign In Happy New Year: What on Earth are you trying to do here - destroy this car? You will. Leave it OE. If you just want to empty fuel tank find another way, suction out what you can and drop the tank, T Hammer Time Ultimate Carjunky / Moderator Dec 31, 2022, 5:28 AM Post #3 of 4 (5953 views) Re: tricking the fuel pump control module Sign In DEFINATELY NOT! That pump is capable of pressures up to 100PSI. It uses PWM as to vary the pressure to specific circumstances. The system has a fuel pressure sensor on the fuel rail and calculates the required pressure instantaneously from things like temp, acceleration, 0/2 readings, engine load and numerous other factors. I have never heard a worse idea. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. Tom Greenleaf Ultimate Carjunky / Moderator Dec 31, 2022, 6:07 AM Post #4 of 4 (5949 views) Re: tricking the fuel pump control module Sign In Grinder - the worst of cars (this isn't at all) jump all kinds of hurdles to make the thing and work properly. MPG, low emissions and all safety concerns. So what flipping web something made you think you could improve it? Whole companies fail your chances aren't as high as that altering it and make an improvement, T (POINT = THE WEB IS FULL OF BS DON'T TRUST IT)   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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