Symptoms of Bad Fuel Pressure Regulator and How to Test if it Has Failed

This was helpful thanks.

Thanks!

Thank you so much Sir

Great info

What should the vacuum reading be? Low vacuum causes a lean misfire, Right. ?

Ok so it it the bypass control. Can you check function with a mighty vac on a regulator out of the box? If I apply vacuum will you be able to blow through the fuel section or does it require 30 plus pounds to open it?

Is a fuel pressure regulator itself supposed to pull vacuum when the vacuum hose has been removed while at idle? Not the vacuum hose, but the regulator itself. Thank you

My 96 f150 is having this exact problems … how about a stronger pressure regulator, or heavy duty..regulator..??

My question is could a bad fuel regulator cause the fuel pressure to pulsate? Even after you’ve changed the fuel pump. This is for an ls swap

will a bad regular cause it to crank up… odd? like slow as in not enough pressure so it’s a lag but not slow as in bad starter slow

i have a 2001 nissan fortniter i changed the fuel pump and fliter it still stalls out like its not getting enough fuel

So my Corolla has this huge weird issue where it takes long maybe like 5-6 turns before it starts in a hot day (morning start) after engine has been running regular temp, stop at a store for 10-15 mins crank takes 7-8 turns. On a below 60 degree day this is no longer an issue anytime. Engine starts immediately. Is this a symptom?

All fuel pumps do not run in the key on position , some run while cranking .

Is it normal for it (fuel pressure regulator) to hiss if pressure is fed from the fuel pump?

Hey man if I turn on my fuel pump with a scan tool am I supposed to hear hissing from the fuel pressure regulator because I've been having some serious fuel pump issues so I changed my fuel pump fuel filter because I'm having a loss of power when I accelerate at low speed and then my fuel pump would just give out

What if one of the injector is leaking and not the FPR?

based on your info it doesnt seem to be my fpr. if its running rich it means spark plugs would be black, so i checked my spark plugs and they a clean. so maybe it is running lean thats why im having long start times. heres where your info looks useful to me(pls correct me if im wrong) . you said if i turn off the key then pressure would slowly go down that results in long start times because it cant hold pressure. but this isnt the case with my long start time. first thing in the morning the engine is cold, my engine starts with one click no problem, but after its been running a few minutes if you turn it off again thats when it has a hard time starting back again. i try to do the on-off three times trick and it doesnt work. the only way it starts with one click again is to let the engine cool for about a half hour to an hour. so it losses pressure when its hot, but starts right up when its cold? my fpr is connected to the fuel rail theres no gas leaking through the vacuum hose i checked.

GM 5.3 LS. Has the regulator on the fuel rail and a teeny tiny vacuum line to it from the manifold. The rubber on the vacuum line is cracked, so it must leak and not be proper vacuum at the regulator. This should cause a constant high fuel pressure, correct? Now the truck also has a recurring P0420 code. Could this tiny vacuum line leak be the cause? Engine otherwise runs super smooth and solid.

My fuel presure regulator hose is shut and it dosnst connect to intake manafold. Could this cause misfire and rich condition, when accelarating fully car missfires and hesitates. Its fsi 1.6 engine Also spark plugs and coils are changed

Hello, just one question. I have a Kia creator 1.6cc.running rich even at idle. Gas in the oil and a intermittent misfire. Change all the coils injectors, charcoal canister and whole fuel pump assembly because the fuel reg. Is on on it. No shredder valve on rail. Any suggestions please?