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Fuel stops My 20HP B&S engine stops for lack of fuel. If I disconnect the fuel pump then start the engine and then reconnect the fuel pump, it runs fine only to stop again in a half hour or so. It seems that I can keep doing this indefinitely.

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This realy makes no sense, the pumps are normally a simple vacume type, they take the positive and negative pressure from the top of the engine to work the pump diaphram, i can only think there is a problem with the pump, they are not servicable so it will need a replacment

Posted on Dec 11, 2012


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Posted on Jan 02, 2017

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SOURCE: Sears 19 hp twin 42 inch tractor, won't start if hot

Two things come to mind. First it could be not getting enough fuel when hot due to carb adjustment being too lean. That could be that the float level in the carb is set too low or the low speed jet is set too lean. When cold the choke circuit in the carb supplies the extra fuel required.
Second in some enjines that have low compression they start cold but when hot the compression drops below 60 psi and makes starting very difficult until engine cools down.
I suspect a fuel problem.

Posted on Dec 31, 2008

  • 247 Answers

SOURCE: Champion Vantage 35 - mower will not keep running

More than likely the jet in the carb is somewhat clogged. Did this just happen after sitting for the winter? If so, start the mower and when it starts to die pump the primer to keep it running. Sometimes it will clean itself in a few minutes. If not, carb cleaner or take the carb bowl off and clean the jet.
Hope this helps
Pls rate the answer

Posted on Mar 20, 2009

  • 48 Answers

SOURCE: I have a problem a Craftsman 18hp 42 in deck--it stops running.

The problem is called vapor lock. It occurs when the fuel in your supply line is vaporizing just before it gets to the fuel pump and the fuel pump is not designed to pump vapor so you run out of fuel.

Possible solutions are to re-route your fuel line so that it doesn't get hot from the engine and/or run the mower during the cool parts of the day only. It might be as simple as getting some new gasoline as winter bought gasoline will always vapor lock if used in the summer time as they alter the formula for gasoline on weekly basis to stay ahead of vapor lock problems nationwide. Way back when cars were mostly carbureted it was a MAJOR summer time pain. The three options given above remain the best solutions for this ages old problem.

Posted on Jun 28, 2009

  • 1 Answer

SOURCE: The engine runs and then stops after running.

I have a old 2010 Diesel did the same. It was the fuel return line from the pump to the fuel tank. It's a short ? 10" long line.
Replaced it, now it runs for ever.

Posted on Aug 29, 2009

  • 123 Answers


Sounds like the float in the carb is leaking by the set.

Posted on Dec 12, 2009

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Where is the fuel pump located in a 1985 fiero


The Fiero is equipped with a electric fuel pump and gauge sending unit mounted in the fuel tank. The pump is serviced and a complete unit by removing the fuel tank.

CAUTION To reduce the risk of fire and personal injury, it is necessary to relieve the fuel system pressure before servicing any fuel system component. If this procedure is not performed, fuel may be sprayed out of the connection under pressure. Always keep a dry chemical (Class B) fire extinguisher near the work area.

  1. Disconnect the negative (-) battery cable.
  2. Relieve the fuel system pressure.

Remove the fuel pump fuse from the fuse block located in the passenger compartment. Start the engine and run until the engine stops due to the lack of fuel. Crank the engine for 3 seconds to ensure all pressure is relieved.
  1. Drain all the fuel from the tank using a suction pump.
  2. Raise the vehicle and support with jackstands.
  3. Disconnect the wiring from the tank.
  4. Remove the ground wire retaining screw from under the body.
  5. Disconnect all hoses and filler neck from the tank.
  6. Support the tank on a jack and remove the retaining strap nuts.
  7. Lower the tank enough to disconnect the fuel sending unit wires.
  8. Disconnect the fuel line, vapor line and return line.
  9. Remove the tank from the vehicle.
  10. Remove the fuel gauge/pump retaining ring by turning the cam lock ring counterclockwise using a spanner wrench such as tool J-24187.
  11. Remove the gauge unit and the pump.

To install:
  1. Inspect the fuel pump attaching hose for any signs of deterioration and replace if necessary. Also, check the rubber sound insulator at the bottom of the pump.
  2. Push the fuel pump assembly into the attaching hose.
  3. Using a new O-ring seal, install the pump assembly into the tank.
  4. Install the cam lock ring over the pump and lock by turning clockwise with a spanner wrench J-24187 or equivalent.
  5. Support the tank on a suitable jack.
  6. Raise the tank enough to connect all fuel and filler hoses.
  7. Connect all electrical wires to the pump and tank.
  8. Raise the tank and install the retaining strap nuts. Use new sound reducing pad if they are damaged. Check all connections and wire to ensure proper installation before refilling the tank.
  9. Refill the tank with unleaded fuel. Reconnect the negative (-) battery cable.
  10. Start the engine and check for fuel leaks and gauge operation.

Nov 07, 2010 | 1985 Pontiac Fiero

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Where is the fuel pump located

Inside the tank. R&R procedures below. Let me know if you have questions.


  1. Reduce pressure in the fuel lines as follows:
    1. Turn the ignition to the OFF position.
    2. Loosen the fuel filler cap to release fuel tank pressure.
    3. Disconnect the fuel pump harness connector located under the rear seat cushion on Elantra or in the area of the fuel tank on the remaining models.
    4. Start the vehicle and allow it to run until it stalls from lack of fuel. Turn the key to the OFF position.
    5. Disconnect the negative battery cable, then reconnect the fuel pump connector.

  2. Raise the vehicle and support it safely.
  3. Remove the fuel tank from the vehicle. Disconnect the hoses at the pump.
  4. Unbolt and remove the pump from the tank.

To install:
  1. Install the new pump with new gasket in place into the fuel tank and secure.
  2. Install the fuel tank into the vehicle.
  3. Connect the fuel lines and the electrical connectors to the fuel pump and sending unit.

8.Connect the negative battery cable, pressurize the fuel system and check for leaks.

Sep 25, 2010 | 1992 Hyundai Excel

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Where is the fuel pump on a 1995 Nissan PU

see instructions from AutoZone:
The fuel pump assembly is located in the fuel tank. Refer to the fuel tank assembly illustrations in this section. On most applications, the fuel tank must be lowered to remove the fuel pump assembly. The fuel pump assembly is cooled by the fuel in the tank.


See Figure 1
  1. Before disconnecting the fuel lines or any of the fuel system components, release the fuel system pressure as described previously in this section. Releasing system pressure is a very important step for the correct removal of the electric fuel pump.

0900c1528018d240.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Fig. 1: Internal view of the electric fuel pump
  1. Disconnect the negative battery cable. Unfasten the fuel pump assembly electrical connector and remove the fuel tank inspection cover.

If the truck has no fuel tank inspection cover, the fuel tank must be lowered or removed to gain access to the in-tank fuel pump.
  1. Disconnect the fuel outlet and return hoses. Remove the fuel tank assembly, if necessary.
  2. Remove the ring retaining bolts and the O-ring, then lift the fuel pump assembly from the fuel tank. Plug the opening with a clean rag to prevent dirt from entering the system.

When removing or installing the fuel pump assembly, be careful not to damage or deform it. Always install a new O-ring.
To install:
  1. Install the fuel pump assembly in the fuel tank with a new O-ring. Install the ring retaining bolts. Install the fuel tank if removed.
  2. Reconnect the fuel lines and fasten the electrical connection.
  3. Connect the battery cable, then start the engine and check for fuel leaks.

The "Check Engine Light'' may stay on after installation is completed. If so, the trouble code in the control unit's memory must be erased. To erase the code, disconnect the battery cable for 10 seconds, then reconnect it a verify that the light is extinguished.


See Figures 2 and 3
  1. Relieve the fuel system pressure, as described previously in this section.
  2. Disconnect the fuel inlet hose at the electro injection unit.

0900c1528018d241.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Fig. 2: Make sure that the fuel line hose clamps are installed properly

0900c1528018d242.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Fig. 3: Testing fuel system pressure using a gauge and a "T'' fitting
  1. Install a fuel pressure gauge.
  2. Start the engine and check the fuel line for leakage.
  3. Read the pressure on the pressure gauge. The gauge should read approximately 36.3 psi (250 kPa).
  4. Relieve the fuel system pressure again.
  5. Remove the pressure gauge from the fuel line and reconnect the fuel inlet hose.

Aug 25, 2010 | 1995 Nissan Pickup

1 Answer

Fuel pump comes on some time when you turn on the ignition some times it doen't. Wait a while turn ignition back on and it will run.

The relay or fuel pump is going bad. Probably a fuel pump.

Mechanical Fuel Pump REMOVAL & INSTALLATION The fuel pump is located on the passengers side of the engine towards the front of the car. Fig. 1: Fuel system component layout — carbureted models 86835007.gif
Fig. 2: Mechanical fuel pump assembly mounting — carbureted models 86835008.gif
  1. Disconnect the negative battery cable. Remove the fuel pump cover.
  2. Clamp the fuel lines closed with fuel line clamps or equivalent, to prevent fuel from running out. Wrap a rag around the fuel lines and disconnect them from the fuel pump. NOTE: When disconnecting the fuel lines, twist and slide them off to avoid damage.
  3. Remove the fuel pump retaining bolts and remove the pump from the engine. To Install:
  4. Clean the gasket mating surfaces and using a new gasket, install the fuel pump in position on the block.
  5. Tighten the fuel pump retaining bolts to 17 ft. lbs. (24 Nm).
  6. Reconnect the fuel lines and make sure that they are tightly clamped. Do not over tighten the clamps or you will damage the hoses.
  7. Connect the negative battery cable and start the vehicle. Check for leaks at the fuel pump.

Jul 02, 2010 | 1994 Honda Civic Del Sol

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Location of fuel pump for 1992 subaru loyale wagon


See Figure 1

0900c15280067055.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Fig. 1: Fuel pump assembly mounted under the vehicle-1.8L engine
  1. Release the fuel system pressure. Do not reconnect the fuel pump harness.
  2. Disconnect the negative battery cable.
  3. Raise and support the vehicle safely on jackstands.
  4. Clamp the middle portion of the hose connecting the fuel tank pipe and the pump to prevent fuel from flowing out of the tank when unfastened.
  5. Loosen the hose clamp and disconnect the hose.
  6. Remove the three pump bracket mounting bolts and remove the pump together with the pump damper.

To install:
  1. Install the fuel pump and damper, and tighten the bolts securely.
  2. Install the hose and tighten the clamp screw to 9-13 inch lbs. (1.0-1.5 Nm).
  3. Install the pump bracket in position to the vehicle body and secure it with the bolts.

Take care to position the rubber cushion properly.
  1. Connect the pump harness.
  2. Connect the negative battery cable and test the fuel pump for proper operation.
  3. Check for fuel leaks.


  1. Turn the ignition ON and listen for the fuel pump to make a growling sound. Turn the ignition OFF .
  2. Release the fuel system pressure. Disconnect the pump harness and crank the engine for 5 seconds or more. If the engine starts, allow it to run until it stops. Turn the ignition OFF and install the fuel pump connector.
  3. Disconnect the fuel hose at the fuel pump.
  4. Connect a gauge in-line using a T-fitting.
  5. Start the engine and measure the fuel pressure. If the fuel pressure is not 36-50 psi (248-344 kPa), replace the pump.
  6. Release the fuel system pressure and remove the gauge.

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3 Answers

What is the correct fuel pressure at the rail for a 2004 Lincoln Aviator?

Disconnect the electrical connection to relieve the system's pressure. Start the Navigator and let the engine run until it stalls from lack of gasoline. Turn off the ignition, reconnect the pump's electrical connection and disconnect the negative battery cable.
  • Step 2 Detach the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.
  • Step 3 Twist off the fuel pressure test port cap and secure a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. The pressure gauge needs to read 45 psi when at wide open throttle. High pressure readings indicate a malfunctioning pressure regulator. Low pressure readings indicate a clogged fuel filtermag-glass_10x10.gif or a broken fuel pump.
  • Step 4 Cut the engine. Relieve system pressure and remove the negative battery cable again so you can safely remove the fuel filter to check for clogs.
  • Step 5 Loosen the filter fittings and unhook the fuel lines from the filter. Undo and remove the bracket on the fuel filter.
  • Step 6 Inspect the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably a faulty fuel pump.
  • Mar 07, 2010 | Lincoln Aviator Cars & Trucks

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    Ran out of gas,after putting gas it still wont start could it be the fuel pump? and where is it located?

    did you check the fuel pump fuse and relay,if ok then fuel pump.fuel pump is located inside the tank,good luck let me know..

    Jun 04, 2009 | 1994 Eagle Talon

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