1986 Acura Legend StickShift....I also have a problem starting my Vehicle when Car gets Hot....I've replaced Fuel Filter, Fuel Pressure Regulator, Fuel Pump is still Original, It has been Checked!

Acura legend says, 38--46 psi. I believe that spec is with fuel pressure regulator vac line disconnected and plugged. I'm not sure how you are checking fuel pressure? My info says there is a banjo bolt on fuel filter and a service plug in the top of banjo bolt. Usually after the vehicle sits over-night, not much pressure on the system, but, you still need to be aware. Place shop rags around service plug, slowly loosen service plug, then you may need a banjo bolt service adapter to screw in place of the plug so you can use fuel pressure gage.
If you have different model then I need to know model and engine size?

fuel pump going out and it will not run at all
coil problem will starteasy but fail after running for a while
fuel pump relay again it is running after starting and if the relay is no good , it will not pump fuel
try having the fault codes read first then have the faulty sensor replaced

so the problem is that you cannot get it into gear from a stop
(grinds trying to force into gear) . if you have a clutch pedal, what I mean is that clutch pedal has pressure behind it,moves up and down by itself, then its a clutch assy needs replaced.clutch disc/pressure plate/release bearing. if there is no pedal,falls to floor, its either clutch slave or clutch master failure issue(lost all fluid). but nothing points at needing a transmission,it should be fine

REMOVAL & INSTALLATION

Print
The fuel pump on all models except the 1986-90 Integra, is located in the fuel tank. On the 1986-90 Integra the fuel pump is located under the rear of the vehicle, near the drivers side of the fuel tank.

PRESSURE TESTING

See Figure 1
On all models, the fuel pump should run for about 2 seconds when the ignition is first turned ON . By removing the filler cap and listening at the filler, it should be possible to hear the pump run each time the ignition is switched ON . It will then stop again until the starter is activated.

Fig. Fig. 1: Checking the fuel system pressure

1. Disconnect the negative battery cable and remove the fuel filler cap.
2. Relieve the fuel system pressure.
3. Remove the service bolt and attach a fuel pressure gauge to the top of the fuel filter.
4. Start the engine and measure the fuel pressure with the engine idling and vacuum hose to the pressure regulator disconnected;

1986-1989 Integra-35-41 psi. (240-279 kPa) 1990-93 Integra-37-44 psi. (255-304 kPa) 1989-90 Legend-36-41 psi. (250-279 kPa) 1991-93 Legend-38-46 psi. (265-314 kPa) Vigor-43-50 psi. (300-350 kPa)

1. Check to see that the pressure decreases when the vacuum hose is connected.
2. If the pressure is higher than specifications, check for a pinched or clogged fuel return hose or faulty pressure regulator.
3. If the pressure is lower than specifications, check for a clogged filter, defective pressure regulator or leakage in the fuel line.
4. After inspection, remove the pressure gauge and install the service bolt with a new washer.

REMOVAL & INSTALLATION

1986-1989 Integra

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure.
3. Raise and safely support the vehicle and remove the left rear wheel.
4. Remove the fuel pump cover bolts and the cover.
5. Remove the fuel pump mount bolts and the fuel pump with it's mount.
6. Disconnect the fuel hoses and the electrical connectors.
7. Installation is the reverse of removal. Use new sealing washers when connecting the fuel hoses. After the pump is installed, turn the ignition switch ON and OFF a number of times to pressurize the system and check for leaks.

1990-93 Integra and Vigor
See Figures 2 and 3

1. On Integra, remove the rear seat and access panel and disconnect the wiring.
2. Remove the fuel tank.
3. Remove the pump flange mounting nuts and lift the pump out.
4. Installation is the reverse of removal. Use new sealing washers when connecting the fuel hoses. After the pump is installed, turn the ignition switch ON and OFF a number of times to pressurize the system and check for leaks.

Fig. Fig. 2: Removing the fuel pump access cover-Legend and Vigor

Fig. Fig. 3: Removing the fuel pump assembly-Legend and Vigor
Legend

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure.
3. Remove the maintenance access cover in the luggage area.
4. Disconnect the fuel lines and the electrical connectors.
5. Remove the fuel pump from the fuel tank.
6. Installation is the reverse of removal. Use new sealing washers when connecting the fuel hoses. After the pump is installed, turn the ignition switch ON and OFF a number of times to pressurize the system and check for leaks.

it could be a fuel pressure problem, or the none return valve is not working. (regulator) could even be a blocked filter in the fuel line. worst case its the pump.

There is a valve on the fuel pressure regulator that looks like a valve on a tire hook a fuel pressure gauge up and try to start your Acura

Acura Coupes and Sedans 1986-1993 Repair Guide
Fuel Filter

• REMOVAL & INSTALLATION

Print
The recommended change interval for the fuel filter on all models is 60,000 miles under normal service. Severe service will require more frequent changing of the fuel filter.
The filter is located in the passengers side of the engine compartment.

CAUTION Before disconnecting any fuel lines, be sure to open the gas tank filler cap to relieve any pressure in the system and wrap a shop towel around the fuel line fitting before opening. Observe all fuel handling precautions.

REMOVAL & INSTALLATION

See Figures 1, 2 and 3

1. Disconnect the negative battery cable.
2. Wrap a shop towel around the fittings and using a proper wrench, slowly loosen the fuel line fittings.
3. Remove the 2 banjo bolts from the fuel lines.
4. Remove the fuel filter clamp retaining bolt and the clamp.
5. Remove the filter from the vehicle.

It is very important that ALL of the fuel line banjo bolt washers be replaced every time the banjo bolts are loosened. If the washers are not replaced the fuel lines will leak pressurized fuel causing the risk of fire or explosion.

1. Install the new filter in position and tighten the clamp mounting bolt to 7 ft. lbs. (10 Nm).
2. Attach the banjo fittings with new washers in place. On Legend and Vigor, tighten the fuel line flare connector to 28 ft. lbs. (38 Nm). On the remaining models, tighten the banjo fitting bolts to 20 ft. lbs. (27 Nm).
3. Start the vehicle and check for leaks.

Fig. Fig. 1: Disconnecting the fuel lines from the fuel filter

Fig. Fig. 2: Fuel filter replacement-1991-93 Integra

Fig. Fig. 3: Fuel filter replacement-Legend and Vigor

WELL I WAS GOING TO SAY REPLACE FUEL FILTER, CLEAN FUEL INJECTORS BY ADDING A CAN SEAFOAM TO 3/4 TO FULL TANK OF GAS.REPLACE SPARK PLUGS AND WIRES. DO A LITTLE TUNE UP SEE IF HELP COLD START CONDITIONS. IF CAR STILL TAKES A LONG TIME TO CRANK. FUEL PUMP FAILING THE CHECK VALVE IN FUEL PUMP IS ALLOWING ALL FUEL LEAK BACK IN THE FUEL TANK.

It is your main relay. Go to Youtube and search acura legend main relay. The main relay is located by your feet above the steering column. The solder point in the relay are weak due to temperature in the car while sitting and the outside temp is high. Also do a google search. several schematics on location. I would tap mine while turning the key and it would fire right up. Best solution is to remove and resolder the joints that are bad. Visually you will know.

Tim D.

Your fuel pressure should be 35-41 psi with your vacuum hose disconnected from pressure regulator and you can attach pressure gage at the bleeder vent on top of the fuel filter make sure your pressue gage is intended for fuel not air.