94 deville the fuel pressure regulator doesnt have a vacuum line on it where does the vacuum line came from the car takes off really slow is that the causethe vacuum leak

fuel pressure problem could be the pump the flow filter in the pump or the filter on the line. if the fuel pressure is ok before the fuel regulator and not after the regulator then the regulator can be the problem, fuel filter in the tank around the area the pump is hit the bottom while the engine is not running this can sometimes push the tank sediment out of the pump filter, fuel filter this would need replacing, its recommended to change them around every 2 to 3 years. regulators, they dont really go wrong but if they do its usually from much getting to the regulator, via a damaged filter, you would need to remove the regulator and back flush it with the regulator in the open positing some are electric and some are vacuum feed. usually if the take feed is slow and it blocks at the tank then replace the fuel filter 2 to 3 times, as the pump can pass the muck into the filter over time.

A ruptured diaphragm in the fuel pressure regulator will let extra gas enter the engine through the vacuum line to the regulator. Pull off the regulator vacuum line. Any evidence of gas? Let the engine idle a couple of minutes with the vacuum line off. If any gas starts coming out of the vacuum line nipple on the regulator, then that was the problem. Replace the fuel pressure regulator.

do you mean the pressure relief valve, this is located normally on the low pressure or return side of your fuel rail, this is designed to maintain fuel pressure in your fuel rail constant, e.g. steady running requires steady pressure, acceleration requires increased pressure controled by engine vacuum, if it was on the supply line you can not regulate the pressure supplied to the injecters. stopped engine requires no pressure so the pump gets turned off with the ignitionf

1991-94 Models - REMOVAL & INSTALLATION

1. Remove the air intake tube and resonator assembly.
   
2. Properly relieve the fuel system pressure.
   
3. Remove the bolts from the fuel line clip.
   
4. Using a 15 / 16 in. (24mm) backup wrench to prevent damage to the inlet port and bracket, disconnect the fuel inlet and return lines from the pressure regulator/fuel rail assembly.

If difficulty is encountered accessing the fuel return line nut, loosen and/or remove the fuel supply and rail attachment fasteners.

1. Disengage the fuel pressure regulator vacuum hose.

Fig. 6: Disengage the fuel pressure regulator vacuum hose

Fig. 7: Use a suitable wrench to loosen ...

1. Remove the regulator assembly attaching screw, then remove the regulator assembly. Plug the regulator port in the fuel rail with a clean rag to prevent system contamination.

Fig. 8: ... and remove the mounting screw from the pressure regulator/fuel rail assembly



Fig. 9: Remove the fuel pressure regulator assembly from the fuel rail

1. Do not remove the O-ring from the retainer in the pressure regulator fuel outlet, unless it is damaged and requires replacing. Always remove and discard the O-ring from the fuel inlet.

To install:

1. Lubricate the new fuel inlet O-ring and, if necessary, the new outlet O-ring with clean engine oil, then install the O-ring(s) in the pressure regulator assembly.
   
2. Position the regulator assembly to the fuel rail. Coat the threads of the attaching bolt with Loctite® 242 or an equivalent threadlock, then install the bolt and tighten to 106 inch lbs. (12 Nm).
   
3. Connect the fuel pressure regulator vacuum hose.
   
4. Connect the fuel inlet and return lines, then tighten the lines to 133 inch lbs. (15 Nm) using a backup wrench to prevent port damage.
   
5. Cycle the ignition switch to prime the fuel system, then start the engine and check for fuel leaks.
   
6. Turn the ignition OFF and install the air intake tube and resonator assembly.

Hope this helps (remember to rate and comment this answer).

Sounds like a fuel pressure problem check fuel regulator by taking vacuum line off and checking for fuel laying inside line.If fuel is in line replace regulator.If no fuel in line then check pressure it should be 9-13 psi with key on engine off.If not within specs replace pump.

I would check the fuel pressure regulator, remove the vacuum line from it and start the engine. Look for fuel coming out of the vacuum port on the regulator. If you see fuel, replace the regulator due to a ruptured diaphram

CHECK FUEL PRESSURE IT SHOULD BE 41 TO 47 PSI. IF NOT REPLACE FUEL FILTER..IF DONT HELP FUEL PUMP BAD.IF FUEL PRESSURE GOOD.CHECK VACUUM LINE TO FUEL PRESSURE REGULATOR SHOULD BE GETTING VACUUM IF NOT FIX BROKEN VACUUM LINE TO PRESSURE REGULATOR.IF FUEL PRESSURE REGULATOR GETTING VACUUM THEN THE FUEL PRESSURE REGULATOR IT SELF IS BAD.

Ck your fuel pressure regulator. pull of the vac hose at the regulator, if it has fuel in the line, the fuel pressure regulator will need replacement.

If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.

there's a cop setting behind you lol no it's most likely a fuel condition