the

Ford Vehicles: Fuel Rail Pressure Sensor Replacement P0191

what's up guys today we're going to be

changing out a feel rail pressure sensor

that is common on the newer Ford's and

what they use these for is so they can

have full control order fuel system very

precise control over the fuel pressure

and they made the system for turn lists

by varying the duty cycle to the fuel

pump so these actually fail more often

than you think now this one we're

changing out because there was a problem

with a lightning strike and it's about

the sensor it's a very sensitive

electronic device and these are very

easy to get to just about every engine

that is out there there are a few

precautions I want to go over before you

ever pull these off look so simple to

change out you want to change them out

and when the engine is nice and cool

it's been off for a while so there's no

pressure buildup in the system you may

think okay the engines in all four to

three hours yeah still summertime guess

what the engine heat is just making that

fuel pressure inside of the rail really

like skyrocket inside of it from the

heat soak from it sitting there so I'll

actually spray out and be all over

everything and can actually start a fire

on there so make sure you wait for it to

get nice and cool they let it sit for

hours upon hours so everything's nice

and cool make it take this off with

minimal fuel leakage and of course be

safe for doing it now just about every

vehicle this sensor is very easy to get

to I'm sure there's some that are behind

the intake and underneath the intake on

there but basically you just look for

the fuel rail and then you'll find a

sensor that's going to look very very

similar to this they'll all have a

reference vacuum line going to them and

a connector looks just like that they're

all the same style like that and it'll

have two bolts that is holding into the

fuel rail on there so it's follow fuel

rail around and you'll know right away

if you have one

on your vehicle or not okay so we're

over here on the engine compartment of

this oh five Ford Escape 2.3 liter

course only has one fuel rail so it's

very easy right here in the front to

find it on here now it can be in the end

of the fuel rail be in the middle like

this one it doesn't matter maybe bolted

right on top like this so we're going to

go ahead on a cool cool engine and we're

going to pull the vacuum line off of

there okay and use it pick something

like this so we can move it off of there

without splitting anything because these

these these lines get really brittle

after a while being in the heat under

the hood here then we're going to

disconnect the electrical connector okay

and it's not totally necessary to

disconnect the negative on the battery

but it is a good idea I generally don't

but I've been doing so freaking long it

doesn't really matter anymore to me so

we're pulling harnesses all the way that

may be in the way so we don't pinch them

going back down and clamping it down and

then underneath it okay we're going to

take some rags that you can throw out

paper towels stuff like that and we're

going to put it underneath this one here

there's going to be some fuel spillage

either way okay now you're gonna want to

pull off with hand tools only and the

reason being is any kind of electric

little impacts or something like this

they're brushed DC motors so they're

going to have arcing when that brush

goes over that commutator face on there

and you don't want sparks

next to fuel vapors for sure so that's a

given but maybe people don't think about

that and I want to put that out there

we're going to start pull us off in here

now just in case there is fuel pressure

in here what we're going to do is we're

going to take it off crack the bolts

okay loosen them brakes work on them and

do it evenly on both sides okay and what

you can do is back them off a little bit

make sure it's still in there okay and

if you're worried about fuel pressure

being in there leave them in and you can

start wiggling it till it pops up and

out of there

any kind of pressure in there there we

go it would have sprayed out by now

take these both put off to the side they

are certain size okay

don't lose them and then you could take

off the rest of the way if you're really

worried about fuel pressure still put a

rag over it and then grab it lift

straight up okay looks something like

that and then same thing going back in

like I said it's very simple we'll make

sure that this thing is not clogged up

in any sort of way I want make sure

they're mounting surface on here is nice

and clean your bolt hold all that and

then you're want to take your new sensor

put a little bit of grease I mean just a

little bit okay on the o-ring on there

so it slides in easily and doesn't tear

and then we're simply going to push it

back down in there it can be hard to

push it in there a little bit because

the o-ring is so plush on there which is

a good thing make sure it's fully seated

you drop down and fully see without you

having to press on it any further on

there at that point you can start lining

these bolts up on here do one at a time

before you tighten it down so you make

sure that one lines up all the way and

we don't start cross threading and then

you can simply tighten them down now

hand tight with a quarter inch like this

is just fine on there there's brass

inserts in there for strength and it's

not going nowhere and then we'll put the

vacuum line back on put it on nice and

straight push it straight on to there

you don't want to break that nipple off

of there these sensors are ultra

expensive but you can give a lot cheaper

on Amazon I'll link to that down below

and then over here your connectors the

last part on here make sure it's free of

corrosion little pins inside of there I

like to put a little bit of dielectric

grease in their electrical grease just

to protect the pins in there and then

we'll clip this in until it snaps like

that

and they get our rags out here and what

you want to do is make sure there's any

fuel spilled anywhere on here that you

clean it up okay so we're going to turn

the key on and we're going to pressurize

the fuel system a couple times and make

sure there's no leaks before we ever you

know put this start the engine and start

getting the heat going here and all that

stuff work potentially dangerous for a

fire so we're just going to turn the key

couple times pressurize it let it sit

come back and inspect and then we'll be

safe to start the engine so as you can

see changing the sensor is very very

simple but you need to follow those

precautions so that you don't get a face

full of fuel or start your vehicle on

fire make sure it's cold engine make

sure that you're using only hand tools

make sure you got plenty of rags soaked

up all the fuel in case it does spray

out loosen the screws let the pressure

come out if there is any and be safe

about it now the other thing I want to

talk about is a sensor brand itself may

be tempted to go aftermarket because

this sensor is quite expensive it's like

a one hundred ninety three dollars for

the sensor I think my price from the

dealer was like 143 for my company you

can buy a SAN exact sensor motor craft

the exact you know exact same sensor

that you buy the dealership

that's calibrated just for your vehicle

for ninety three dollars or ninety seven

dollars shipped to your door totally

cheap and it's the exact same price as

the aftermarket online also so why would

you not get the motor craft was made

just for your vehicle not to mention a

lot of people are using the F markets

and they're having problems with them

still and what's the point of going

through all this and changing it I'm

paying a lot of money just to have the

problem all over again so I definitely

urge you to use motor craft and like I

said I amazon they're the cheapest I'll

link down below to this one so you guys

can get a reference and then you look up

your vehicle there on the buyers guide

on there and you can save a lot of money

and put the right parts in there so

hopefully this helps I know this is kind

of scary going into the fuel system just

be ultra safe about it do it in a

well-ventilated

area and you could do it in about five

minutes