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Problem, help High pressure fuel pump delivery duration
Hello everyone! I had a problem with the pressure in the pump. When the gas pedal is pressed sharply, the pressure is abruptly released. Noticed a peculiarity, if the “High pressure fuel pump delivery duration” value of 130 degrees, the pressure in HPFP goes away (in the first picture). If the fuel delivery duration value is less than 100 (second picture), then the pressure in HPFP is maintained normally.
I can't find a description of this parameter “ High parameter “High pressure fuel pump delivery duration” Normal parameter “ High pressure fuel pump delivery duration”
” and which sensor is responsible for it?
tell me guys where can I get this description and how to treat this problem
What mods are on the car? Camshaft? Did you measure lash if you installed a new cam on the HPFP? The cam position sensor tells the pump when to suck fuel in from the low side and when to compress fuel to the high side. The duration may be taken from that sensor. I'm sure some tuners on here such as Chris Crawford and several others may know a lot more about this subject. But telling us your setup gives us more insight as to why this can be happening.
Could you please further elaborate.
ive been stuck on this issue for months now and I’m clueless on what to try next. I’ve already replaced the fuel pump.
Could you please further elaborate.
ive been stuck on this issue for months now and I’m clueless on what to try next. I’ve already replaced the fuel pump.
There is a valve on the high pressure pump. It is held in place by two bolts. It needs to be unscrewed, supply 5 - 12 V from the battery 10-15 times, rinse it with brake cleaning fluid
Just wanted to update this post incase anyone else has this same issue in the future.
turns out a check valve somewhere along the fuel feed lines was stuck, my garage explained that the sensor is somewhere behind that valve and thats why i got a fuel pressure reading without getting the actual fuel pressure.
after replacing the fuel pump, ecu and a 4 months of down time i remember the old saying always look close before you look far.
lesson learned.
Just wanted to update this post incase anyone else has this same issue in the future.
turns out a check valve somewhere along the fuel feed lines was stuck, my garage explained that the sensor is somewhere behind that valve and thats why i got a fuel pressure reading without getting the actual fuel pressure.
after replacing the fuel pump, ecu and a 4 months of down time i remember the old saying always look close before you look far.
lesson learned.
i have to agree. I’m having trouble getting my personally rebuilt engine to start and tips like these are invaluable. I’d never know to check these areas. I’ve picked up several tips on this forum that make this my #1 destination. You guys are the best.
Problem, help High pressure fuel pump delivery duration
I had a problem with the pressure in the pump. When the gas pedal is pressed sharply, the pressure is abruptly released. Noticed a peculiarity, if the “High pressure fuel pump delivery duration” value of 130 degrees, the pressure in HPFP goes away (in the first picture). If the fuel delivery duration value is less than 100 (second picture), then the pressure in HPFP is maintained normally. 
