I reeplaced the fuel pump, fuel filter, and fuel pressure regulator. thinking that was the problem! But was told that the alarm might be the problem so i pressed the alarm twic and the truck started but when i turned it off it wont start again. need some help ! Want to disconnect the system !

two things -- the fuel filter may be blocked and the pressure regulator may not be holding pressure. Replace the filter and have a pressure test done on the fuel manifold to check pump and regulator.. Check that the cat converter is not cracked and blocking the exhaust system

Seem like your fuel pump can't keep up the pressure when engine is started. If you have a pressure regulator that isn't into the pump assembly i would change it if not then your going to need a new fuel pump assembly.

SOUND LIKE FUEL PUMP.REPLACE FUEL FILTER,CHECK FUEL PRESSURE SHOULD BE 9 -13 PSI. FOR TBI FUEL INJECTION AND 55 - 61 PSI FOR MFI MULTIPORT FUEL INJECTION SYSTEM.

When you had the fuel pressure tested did it hold pressure with the key off or did the pressure drop off?

If it dropped off I would bet you have either a leaking fuel pressure regulator or a bad fuel pump. Fuel pressure needs to hold steady especially on a hot engine in order to prevent the fuel in the fuel rail from boil over.

I think the 99 has the external injectors. If it does the fuel pressure regulator is located on the drivers side of the engine about in the middle of the fuel rail. There will be a small vacuum hose attached to it. remove the vacuum hose and see if gas comes out. If it does the regulator is bad. If it doesn't I would check the pump next.

There is no charcoal filter on the return line or the pressure line. The charcoal canister is part of the evap emissions system and will rarely if ever effect the starting of the vehicle.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

The fuel filter is an integral component of the fuel pressure regulator, which is mounted on top of the fuel pump module, located in the fuel tank. When the fuel filter/regulator assembly requires service, the fuel tank must be removed from the vehicle, however, the fuel pump module does not need to be removed.

1. Disconnect the battery ground cable.
2. You dont have to relieve your fuel systems pressure because your jeep has an automatic bleeder.
   
3. Remove the fuel tank assembly.
4. Clean the area around the fuel filter/regulator.

Fig. Fig. 5: Remove the fuel filter/pressure regulator retaining clip from the top of the assembly

Fig. Fig. 6: Replace the old fuel filter/pressure regulator mounting gasket

1. Disengage the retaining clamp from the top of the filter/regulator assembly. Discard the retaining clamp.
2. Using 2 small prying tools, pry the filter/regulator assembly out from the top of the fuel pump module. The filter/regulator assembly will unsnap from the fuel pump module.
3. Remove and discard the mounting gasket below the filter/regulator.
4. Before discarding the fuel filter/pressure regulator assembly, inspect the assembly to verify that the O-rings are intact. If the smallest of the 2 O-rings cannot be found on the bottom of the filter/regulator, it may be necessary to remove it from the fuel inlet passage in the fuel pump module.

To install:

Fig. Fig. 7: Check the condition of the fuel filter/pressure regulator O-rings

1. Clean the recessed area in the pump module where the filter/regulator assembly is to be installed.
2. Check the replacement filter/regulator assembly to make sure that the new O-rings are already installed on the assembly.
3. Apply a small amount of clean engine oil to the O-rings.
4. Install a new gasket on top of the fuel pump module.
5. Press the new fuel filter/pressure regulator assembly into the top of the fuel pump module until it snaps into position (a positive click must be heard or felt).
6. The arrow on top of the fuel pump module should be pointed towards the front of the vehicle (12 O&rsquoclock position).
7. Turn the filter/regulator assembly until the supply tube (fitting) is pointed to the 11 O&rsquoclock position.
8. Install new retainer clamp (the clamp snaps over the top of the filter/regulator and locks to the flanges on the pump module).
9. Install the fuel tank assembly.
10. Connect the negative battery cable.

Pressure regulator could be a factor, but may be part of the fuel pump assembly. Fuel filter could be a factor, but again, with some Chrysler vehicles the filter, regulator and such are all part of the fuel pump assembly.

Locate the Fuel Filter and Fuel Pump

Raise the Neon's rear end on jack stands. Remove the panel inside the trunk covering the fuel pump assembly. The fuel filter should be on top of this. On most Dodge Neons the filter is usually directly attached to the fuel pump. In that case, those two parts should not be separated and should be replaced together.Its a silver dome about 2.5 inchs round with a single plastic hose coming off it.

REMOVAL :-------
WARNING: THE FUEL SYSTEM IS UNDER A CONSTANT PRESSURE, EVEN WITH ENGINE OFF. BEFORE SERVICING THE FUEL FILTER/FUEL PRESSURE REGULATOR, THE FUEL SYSTEM PRESSURE MUST BE RELEASED.

1. Refer to Fuel System Pressure Release in the Fuel Delivery System section of this group. The fuel filter/fuel pressure regulator is located on the top of fuel pump module. Fuel pump module removal is not necessary.
2. Raise vehicle on hoist.
3. Disconnect fuel supply line at the Filter/Regulator nipple.
4. Depress locking spring tab on side of Fuel/Regulator and rotate 90 ° counter-clockwise and pull out. NOTE:Make sure that the upper and lower O-rings are on the Filter/Regulator assembly.

INSTALLATION
Lightly lubricate the O-rings with engine oil.

1. Insert Filter/Regulator into the opening in the fuel pump module, align the two hold down tabs with the flange.
2. 1. While applying downward pressure, rotate the Filter/Regulator clockwise until the the spring tab engages the locating slot.
   2. Connect the fuel line to the Filter/Regulator.
   3. Lower vehicle from hoist.----------------

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I had this problem.I removed the fuel pressure regulator and it was full of carbon.Remove it very carefully as to not damage any seals.Remove as much carbon as you can and reinstall.This should solve your problem.

I have a 2003 Escalade with 114,600 miles on it.... My engine light came on as well. It just a little rough especially when sitting at stop light/sign.... (If your anything like me, my stress level went through the roof.) I took it to Autozone first and a nice young gentleman ran the OBD II Code Scanner for free. The code was 300 which is misfire and it listed possible sources. However, he didn't think the sources were the actual problem and told me to check my fuel filter and fuel pressure regulator..... So I took it to the shop (whom miracously diagnosed it for free, maybe because I told him that I was sure it ws the fuel filter and pressure regulator) He confirmed the problem was the fuel pressure regulator and showed me how it was spitting a bit of gas out everytime I started it (which explained the gas smell I was trying to ignore.)
COSTS:
Fuel Pressure Regulator Parts: $115 Labor: $85
Fuel Filter Parts: ten bucks!!! Labor: three bucks!!!!
Total cost: $224

Was there fuel pressure before you changed everything? It could also be the pressure regulator sticking or bad. When you crank it over and let off the key you should hear the fuel pump run for a couple seconds and then shut off. If it is doing that then I would be looking to see if you have likes hooked up wrong at the back of the engine or try replacing the pressure regulator.