Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Thanks for asking your question. I will try and help you out.
There are several things I have seen cause this.
The first is the relief valve in the fuel pump is faulty and opening and closing.
Second is a restricted fuel return line or the fuel Inlet line. This can cause the fuel pump relief valve to open.
Third is a faulty hand priming pump.
And lastly is a faulty fuel pressure regulator.
Please reply back if you need more help or have more questions. I am happy to assist.
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