5.7 liter locked up after changing fuel pressure regulator

Asked by Chevy993500 Apr 13, 2023 at 10:57 PM about the 1999 Chevrolet C/K 3500 LS Crew Cab LB RWD

Question type: Maintenance & Repair

I just changed the fuel pressure regulator in my 99 Chevy 5.7liter and the
motor clunker and locked up. It can find before this what would cause this to
happen and how do I fix it?

2 Answers
310,545

Gene answered about a year ago

Chances are high that you hydro locked the engine with fuel, remove all the spark plugs, disable the coils then crank over the engine by hand and we if any of the cylinders squirt fuel out the spark plug holes, then let the fuel dissipate in the open air before putting the plugs back in. Then check for fuel in the engine oil, if there’s fuel there then change the oil and filter. After that it should start and run, but be aware that some excess fuel could be in the exhaust system and this could cause a lot of grey/white smoke out the tailpipe for a while until the catalyst gets hot enough to burn off the excess fuel..

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