Hi guys, Can someone enlighten me on locating the fuel pressure relief valve, and also how to take it apart. Thanks. Pics. are always good. TIA

 

Here is the location:



OPERATION
Fuel pressure at the fuel rail is monitered by the
fuel rail pressure sensor. If fuel pressure becomes
excessive, the pressure limiting valve opens and
vents excess pressure into the fuel drain circuit.
REMOVAL
The fuel pressure limiting valve is located on the
top of the fuel rail (Fig. 20).
CAUTION: Cleanliness cannot be overemphasized
when handling or replacing diesel fuel system components.
This especially includes the fuel injectors,
high-pressure fuel lines and fuel injection pump.
Very tight tolerances are used with these parts. Dirt
contamination could cause rapid part wear and possible
plugging of fuel injector nozzle tip holes. This
in turn could lead to possible engine misfire.
Always wash/clean any fuel system component
thoroughly before disassembly and then air dry.
Cap or cover any open part after disassembly.
Before assembly, examine each part for dirt, grease
or other contaminants and clean if necessary. When
installing new parts, lubricate them with clean
engine oil or clean diesel fuel only.
(1) Thoroughly clean area at pressure limiting
valve.
(2) Remove banjo bolt (Fig. 20) at banjo fitting.
(3) Remove pressure limiting valve from intake
manifold.

INSTALLATION
(1) Be sure both top of manifold and limiting valve
are clean.
(2) Assemble banjo bolt and new sealing washers
to limiting valve.
(3) Tighten banjo bolt to 24 N·M (17 ft. lbs.)
torque.

 

anyone else have pics? or input? thanks

 

Whats wrong with the pic that was posted? Thats the relief valve in the pic, its a 1 time use, if it has blown off or leaks, throw it away & get a new one. Or you could tap the inside of the banjo bolt, put in a pipe plug so the fuel doesnt return to the tank. Are you having starting issues? Run a box that ups rail pressure? Floor it diesel makes a billet looking valve for the stock look that is solid, nothing inside it, there not rebuildable. It good to have a rail pressure gauge.

 

theres nothing wrong with the pic. But i am having starting issues and i already checked my Lp and its giving me 8psi so thats good there. i took out the banjo bolt and cranked the motor and fuel came out of the line that the the banjo bolt holds in place. So is the valve junk? i thought the fuel would come out of the rail where the banjo bolt is if it were junk? Any help would be appreciated.n TIA

 

i know the valves are junk and not rebuildable but i dont have money to get a new one yet so i would be capping it if the valve is popped.

 

The line the banjo bolt holds in place is the injector return line, of course you will have fuel out of it.

You need to pull the injector return out of the way, dry out the well under the banjo, then test to see if you get fuel in the well after running and getting fuel pressure up. Any leakage at all and the valve is popped and needs replaced.

 

Good info.^^^

Hey Jordan...

I'm just assuming that you have checked all the basics like pulling your Edge off, fuel filter is clean, etc.....?

Good luck bud,

Alan

 

thanks guys, megacabdad. yes ive done all that. fuelfilter change gives me a good start twice then its back to crank crank crank forever.
no 6 oh no- thnx for everything i will go out and look at this.

 

well i took the truck out for about a 20 min drive got it up 2 temp and gave the rail some pressure and the valve seems to be okay. after 5 mins of sitting after the drive and checking the valve i tried starting it and it cranked rather fast for about 15 secs so i stopped and quit. what should i check next? . im not down on power and theres no blue smoke on startup. no fuel in oil. just saying. my cp3 pump is a little damp with fuel underneath but nothing major and it doesnt leak when its running. at least while i was watching it. any help? lol. also i have 2 codes now. cooling fan speed and exhuast pressure control relay low. codes p0484, p0477.

 

ive decided to check the rail pressure next. warm and cold. do our inectors use oil pressure to fire? if so i was thinking i may have an internal oil leak somewhere. i was talking to my uncle whos a big rig mechanic( 30 years) and he brought it up. but neither of us knew if they used oil pressure. Any info is appreciated. TIA

 

No, the injectors are electronically activated to use rail pressure to fire them. Check your rail pressures on crank and running, you should 3-5k on crank to facilitate a good start. Max rail pressure should be around 19k under full load.

 

The injectors are actuated by a solenoid...

Apply power to the coil and it opens type of deal.

 

savoy1964 you make these forums awesome by posting good info like that thanks

 

Thanks alan. Thats what i thought but i couldnt find my literature on them. Ive been busy with school. They are trying to make us all go insane between now and may haha. well thanks for the reply. ttyl, Jordan