What happens to fuel pressure when engine is off?
So overall fuel pressure is little bit higher than normal. Another thing I noticed is that when I shut off the engine fuel pressure drops rapidly to 5 psi, and I know it is not good. There are no obvious fuel leaks anywhere. So, what can it be? Can fuel pressure regulator be bad? have the same problem? Welcome to 2CarPros.
What does it mean when fuel pressure bleeds off?
Sounds like fuel pressure is bleeding off. It is not uncommon for this to happen on chrysler vehicles with your style fuel pump module. The first thing i would do is check fuel pressure with a fuel pressure gauge. The will be a test port on the fuel rail. You should see roughly 50 psi of pressure and it should hold pressure with the key off.
What should I do if my fuel tank is under pressure?
All power and resistance tests are okay. Then, I removed fuel rail with injectors and watched them while fuel system was under pressure, and no one of them was leaking. Spray patterns are all good enough. Additionally, I decided to stop fuel flow on the pipe from gas tank right after the pressure gauge by holding it with pliers.
Can a bad FPR cause a fuel pump misfire?
If yes, bad fpr, injector leaky and fuel pump check valve could be culprit. P1406 is for the EGR valve. Different issue from fuel pressure drop. EGR or passages could be blocked by carbon buildup. Intake leak, injector and fpr leak can cause P0300 multiple misfire though.
When does fuel pressure drop after turning off the engine?
Turn the engine off, but key on and pressure gradually drops all the way to 18 PSI over 20 minutes. Turn the key off then key on but no engine start, I can hear the 2 second fuel prime and the PSI shoots up to 55 PSI and engine still has to turn over for 3 or 4 seconds without gas pedal, 1 or 2 seconds with gas pedal.
What happens to fuel pressure when you turn the key off?
SOLVED: Fuel pressure bleeds off when i turn the key off . – Fixya Hooked a fuel pressure test up . the pressure pops up to 55 to 58 psi. i turn key off pressure drops down to 15 20 psi Clicking this will make more experts see the question and we will remind you when it gets answered.
Sounds like fuel pressure is bleeding off. It is not uncommon for this to happen on chrysler vehicles with your style fuel pump module. The first thing i would do is check fuel pressure with a fuel pressure gauge. The will be a test port on the fuel rail. You should see roughly 50 psi of pressure and it should hold pressure with the key off.
What should fuel pressure be in a truck?
Fuel pressure test when cold, turn key on and spikes to almost 60psi, then quickly drops to about 10psi, but truck still starts ok. Holds pressure around 52psi. Turn key off and pressure drops rapidly. When motor hot, turn key on and climbs slowly mid 50s, then falls back down. Long crank and need to pump pedal to catch.