How to check fuel pressure on a 2004 jeep wrangler 4.0. where is the the fuel pressure check valve? they are normaly on the fuel rail, but this jeep does not.

is this a double post, i just posted a huge full answer
just a while ago, on gc.
for same pressure..
the pump check balls bad,or fuelpumpreg inside.
or the injectors leak
last poster too, said awhile, 1s, 1min, 1hr what is while>
spec. is 1/2 min leak down or longer.
so>? but keyon 4 times, is fail

unplug injectors, (elect) is pressure 49 +-5 psi? and holds.
now, bingo.
leak down fails now.
yes the filers are all in tank
yes, the injectors can leak

un connect fuel rail hose, to rail block it.
hold pressure now
yes, bad leaking injector
no,, pump assy bad. assembly, why takes bench tests.

a while? 1sec, 1min 1hr?



filter, packed,
where is gage sensor on rail.?
ever get a full tune up?:
the fsm is free here.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
tj unlimited?
2 systems dead head or loop and is key to diagnosis.
looking now.,
49.2psi is spec, +-5 page 2 (so pump is good) but?/...
it is loop but no fuel pump reg at rail.
that is rail pressure not anywhere else.
at 44 you key off the pressure must hold for 1/2 min. or you fail
leak down test, (injector leaks or check ball in pump)
if the check ball fails it will take many key on to get full pressure
2 or 3 second pump runs, each key:?
see why?> unplug injectors see if leak down passes/?
all filters and socks in take, below pump

so it fails leakdown
the only way to find this is to block rail input. line,
if it still leaks tank drops
if it stops the injectors leak (for all those reasons)

the tank regulator has its own loop return feed back
so the rail really is a dead head, with one line there.

It's the tire valve looking connection, located on the top of the fuel rail, which is located on the driver's side of the engine, right on top. It may also have a cap screwed onto it, just like a tire air valve. That valve is used to purge the fuel line of pressure and also to test fuel pressure.

replace the fuel pump,the check valve that holds pressure on the fuel is in the fuel pump.The fuel in the lines is draining back into the tank

Two ways you can check is to listen close to the gas tank while some one turns the switch on to see if you can hear the fuel pump kick on and another way is to check for pressure at the bleeder valve on the fuel rail.

there are two valves on top your fuel tank,
one is a roll over valve that will close off the fuel if the vehicle rolls over,the other is a vent valve that lets pressure escape while your filling it with gas,this valve is not letting the air that is going in the tank with the fuel vent out ,so it is coming out the only hole it has which is the filler tube.

check fuel for pressur and quantati to fuel rail posable fuel pump or regulator

There are several things you can do if you haven't done so already, Check voltage at ignition coil, as soon as the engine starts to turn over there should be voltage. If not, the crank sensor is not triggering the ECM quickly.... on 98-99 wranglers, this was a problem area. Check terminal connectors at the ECM, clean and secure, another area of concern.The module on the side of the throttle body is the air idle control 'motor' as jeep calls it. Over time they tend to carbon up and it results in bad air/fuel mixture and yet fails to send a fault code, you can remove & clean also the O2 sensor in front of the cat. convertor.remove & clean. Check fuel pressure, you should have some residual PSI. Treat fuel system with a good treatment...I like the Lucas products, their fuel system treatment and injector cleaner burns hot & clean.
I hope these suggestions help...and the wrangler returns to top form...good luck.

does it have a vacuum controlled fuel pressure regulator, if so check it for leaks into the intake. Also check fuel pressure

Disconnect your Battery.
Remove your air intake and filter housing all the way to the throttle body. Then use a shop rag and release te pressure in the fuel system by the valve on the fuel rail. use the rag to absorb the fuel as it sprays out the fuel rail.
then you unsrew the 2 bolts holing the rail in place.
Then you pry the rail away from the manifold with a flat head.
being careful not to loose any of your injector seals.
when done clean both your injector seats and the rail seats.
use some assembly lube or shop grease to lubricate all of your injector seals upper and lower seals.
remount all parts as you dismounted.
reconnect your battery cylce the ignition key 4-5 times before starting the egine, and check for leaks. if there is no leak then go ahed and start your engine.