Question about 1995 Oldsmobile Cutlass Ciera

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How many pounds of fuel pressure is required for normal operation when testing with pressure gauge? Car dies when quarter tank low when vehicle is on level ground and when tank is 3/4 full and going down hill, the car dies. I replaced the fuel sending unit (used the same pump) and now the car idles but when I press on the pedal fast, it sputters. The pump / fuel unit assembly was difficult to reposition in the tank, there was a wall barrier, uncertain which side of wall the mesh filter goes on. It fit better on the side that has a reservoir pan built inside the tank (assuming its to reduce gas shifting on the float). The pump appeared to fit tighter with the older fuel unit metal fuel line than the new one; could there be a leak at that bushing sleeve inside the pump? Now the car has difficulty starting, but eventually starts after many attempts. The car then idles after warming up. Even at that point, car dies out when I shift the gear in drive.

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ABOUT 40. You should have put a pump in it while you had it down.

Posted on Dec 30, 2010


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I have 1997 Cadillac Deville 4.6 v8 Northstar 32 valve it has 90 pounds fuel pressure an it should have 40 to 50 pounds why is the fuel pressure so high?

Fuel pressure regulator . plugged fuel return line .

With the ignition switch ON and the fuel pump running, the fuel pressure indicated by the fuel pressure gage should be 333-376 kPa (48-55 psi).
The Fuel Pressure Check determines if the fuel system is providing fuel pressure. The components involved include the fuel tank, sending unit, pump, pipes and hoses, pressure regulator, fuel rail, and injectors. Also checked is the electrical operation of the fuel pump relay. This chart requires J 34730-1A , Fuel Pressure Gauge J 37287 , Inlet and Return Fuel Line Shut-off Adapters.

Feb 18, 2017 | Cadillac DeVille Cars & Trucks


My car just died while driving

If you had an otherwise normally* operating vehicle and while driving just decides to die on you then your problem will most likely be lack or inadequate spark/fuel, most likely fuel related in my experience.
*by normal I mean no overheating, starts fine every time

Tools that may be required - test light ($5), needle nose pliers ($5)
First check the basics such as fuses and spark plug wire connections. make sure all your plug wires are plugged in securely. If so check to make sure any ignition related fuses are not blown. You can do this either by removing and inspecting for any broken fuses or hooking a test light to a ground and probing both sides of the fuse (key must be in the "on" position for this).

Still nothing check for spark at the plugs. Do this by taking your test light and probing one of the plug wires near the plug. Have someone crank the engine, the light should be blinking as engine is turning over. Do this for all wires. If you get a signal each wire, disconnect one of the plug wires, remove the plug and reconnect wire. Have someone crank engine. You should see blue sparks coming from the plug as the engine rotates.

Repeat for all cylinders. (you could also skip the first step and just do this)
If you don't get a spark at a particular plug, then you will need to probe each connection (the wire at the plug, the wire coming out of distributor/coil, the wire coming out of the coil. By doing this you will be able to pinpoint where the damaged component is. If you have nothing into the coil than it is likely an ignition related fuse/relay (solenoid on Fords) is bad.
If you are getting spark to each plug then your problem is fuel related.
To test fuel you will need a fuel pressure gauge (rent for free at auto parts store or pick up a gauge for around $30)
Hookup the fuel pressure gauge at check point (hookup point will vary depending on the vehicle but will likely be on the fuel rail or the throttle body on injected vehicles). Also when you rent/buy the fuel gauge ask them to lookup the fuel pressure. Probably around 40psi and up for a functional fuel system (injected) about 4psi for carbureted (look up pressure at parts store or manual for specific application).
If your fuel pressure reads low, then your filter or pump is bad. Replace the filter and recheck, if still low, replace the pump.

If your pressure reads good than it is likely that your crank and/'or cam sensor(s) or injectors are malfunctioning. The crank/cam sensors are what tell the computer when to fire the injectors. Probe the injector connectors while cranking the engine (there are two wires, one should blink when cranking the engine. If you get a signal than the injectors are bad.
If you still are having issues, than you may have a wiring problem or bad ECU

on Feb 03, 2010 | Ford F-150 Cars & Trucks

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Fuel gauge is not reading properly 2006 Mercury Mountaineer

Fuel gauges are not meant to be precision instruments. You might want to fill up a 2 gallon can and drive the car until it runs out of fuel to see how low the gauge will go before it's really empty. Use the 2 gallons to get back to a filling station.
I once spent three working days trying to get a 1972 Chrysler to read full when it's full, half when it's half and quarter tank when the tank has a quarter amount of fuel. The customer did not want to accept anything else, but in the end all I did was to get close, not exact.
It is possible that the fuel float in the gas tank is "drowned", that is, the plastic float might have a slow leak and some fuel found its way inside. This will cause the float to submerge slightly and give you a low reading. To check this you will have to remove the float unit from the tank.
In any case, if you feel up the job (not easy) remove the float unit from the tank and manually move it up and down while checking the meter reading. You can bend the wire holding the float to correct misreadings.
Personally, I wouldn't bother, just be aware that when the reading is low, feel safe that you still have enough fuel to get to the next filling station.

Apr 04, 2014 | 2006 Mercury Mountaineer

1 Answer

What are the sign's of your fuel pump going bad?

The most obvious bad fuel pump symptoms is your vehicle won't start, or it starts but does not run for very long before eventually stalling out. Your vehicle will act as though it is out of gas, even though the fuel tank is full. As the fuel pump attempts to feed the engine fuel, your vehicle may make bucking noises but will not spark up.
If you do suspect that you have symptoms of a bad fuel pump, you can listen to it to see if it is operating. Electric fuel pumps can be heard when you turn the ignition to the second position, so if you do not hear any sound coming from your fuel tank with the key turned, your fuel pump may have failed or the motor may have burnt out. Also, if you notice that the fuel pump is making an excessive whining noise, it may be a sign that the part is on the verge of failing.
Two common bad fuel pump symptoms that your vehicle may experience are engine misfire at higher speeds, or difficulty climbing hills. These symptoms are a sign that your engine is not getting enough fuel. If you are experiencing these symptoms, you may want to perform a fuel pump pressure test.
In order to perform a fuel pump pressure test, you will require a fuel pressure gauge. By inserting the gauge in the Schrader valve (usually located in the engine compartment), you will be able to determine if your engine is receiving adequate pressure of fuel from the vehicle's tank. The required pressure reading will be different for vehicle specific applications. Most repair garages have one of these gauges on hand to perform this test.
Your fuel pump may fail or become a faulty fuel pump for a number of reasons. Rust, debris and dirt may enter into the vehicle's fuel system, and may potentially be clogging the fuel filter or the fuel strainer. This does not allow enough fuel to pass through to the fuel pump which overheats the parts, causing damage. A second cause of fuel pump failure is damage to internal parts caused by small particles of dirt entering into the fuel pump. The fuel strainer and fuel filter were unable to keep these particles from entering into the fuel. Another major cause of a faulty fuel pump or failure is letting your gas level get too low. When the level of fuel is low, the fuel pump has to work much harder, becomes overworked, does not cool down properly, and as a result can be damaged. You should never let your fuel reach less than a quarter of a tank.

Sep 12, 2013 | 1995 Lincoln Town Car

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Car runs great but it starts hard having to pump it. when running it will shut off especially at low rpms.i take car out of gear and shut off and it will restart.i put new plugs and wires and tps.i tried...

This problem is caused by in most cases the fuel pressure bleeding down when the engine is shut off, this leads to air in the fuel line because the fuel leaks back to the pump and then into the fuel tank. The fuel pump is electric and it has a built in fuel pressure check valve in the pressure outlet of the pump. To confirm this is the problem you must have a fuel pressure leak down test run, the test port to check fuel pressure is on the top of the engine in the pipe that supplies fuel and sets over the top of the fuel injectors. You can purchase a fuel pressure test gauge from most auto parts stores for about $20.00. Hook the test gauge up to the test port (it looks like an oversized tire valve) start the engine and verify you have no leaks at the connection of the gauge, once that is sealed and has no seepage of fuel note the fuel pressure at idle, shut the engine down and watch the gauge, it should not drop more than 4 pounds in one hour, in most cases it will drop off right away. If the fuel pump is the problem you will need to replace it, to do that requires you drop the fuel tank down out of the car, this is a very difficult job on the ground, you will need to raise the car as high off the ground as possible, support it on jack stands and then with a hydraulic floor jack support the fuel tank and remove the filler neck then remove the two steel straps that secure it to the cars underside, once the straps are off slowly lower the tank and remove the fuel lines and the electrical connector from the fuel pump/sending unit connector, then remove the tank and remove the retaining ring that holds the fuel pump/sender module inside the tank. Reverse to assemble, then put at least 4 gallons of gas in the tank to prime the pump.

Jan 08, 2012 | 1994 Oldsmobile Silhouette

1 Answer

My friend has a Mercedes benz C200D it cranks but is not starting

If system voltage is too low the computer won't send any current to the solenoid. So the lights stay bright instead of suddenly getting dim and you getting that click-click-click sound. And now that you have added details that sounds even more likely that the battery is done.Engine cranks normally, but it does not fire: You turn the key to start and hear the starter motor crank the engine, but when you release the key, the cranking stops and there is silence. This means that the battery and starting motor are working properly, but the engine is not firing. If you continue cranking the engine over in this way, the battery will eventually run down and will need to be recharged, but the battery and starter are not the cause of your problem.There are a number of causes for this type of no-start condition, the most common being that you are simply out of gas. Assuming that you have fuel in the tank, you will need to go through a series of tests to determine what is causing the problem. The testing procedure requires that you use specialized equipment in order to determine the problem area. There are three main tests in order to get you pointed in the right direction. You will need to test for Spark, Fuel and Compression, in that order. As soon as you see a problem in one of those areas, that is where you will need to concentrate your efforts.Spark:An easy way to test for spark is with an inexpensive spark tester. This is a device that is readily available at most auto supply stores. You use it by simply holding it next to a spark plug wire. If you see the neon lamp flashing while someone cranks the engine, then you have spark and should move on to checking for fuel. If there is no spark, or a very weak spark, you will have to do a series of methodical tests that vary depending on the type of vehicle. You will need a repair manual for your car in order to get the correct diagnostic procedures. A good source for on-line repair information at a reasonable price is Alldata-DIY.Fuel:First step here is to listen for the fuel pump running inside the gas tank. When you turn the key to run, you should easily hear the pump come on, run for a few seconds to build fuel pressure, then turn off. If you do not hear it, it could mean that the fuel pump or circuitry is bad. (Fuel pump failure is a common problem on modern cars.) Fuel injected cars are very sensitive to proper fuel pressure. If the pressure is off, even by a few pounds, it will cause noticeable performance problems, or a no-start condition. To check for proper fuel pressure, you will need a fuel pressure gauge that is suitable for your type of system. A fuel injected engine (found on just about every vehicle less than 20 years old) produces very high fuel pressures and requires a fuel pressure gauge that reads up to 100 pounds per square inch. This type of gauge has a threaded connector that must match the pressure tap on your fuel rail. Since you are working with a highly combustible fluid which can be quite dangerous if you do not know what you are doing, you should leave this step to a pro.

Oct 13, 2011 | Cars & Trucks

1 Answer

Van die on road ,its able to start with a shot of hot shot but dies ,fuel leaks out rack bleeder valve when pushed .fuel pump is 175 dollars and cant be returned .plz do you have any ideas

Get yourself a fuel pressure gauge and don't guess and start thrrowing parts at the think only to cost you more money,

Get a fuel pressure gauge, 2.4 L, 3.0 L and 3.8 L engine = 49 PSI (Pounds per Square Inch)Remove the ground cable from the negative battery postand also remove the fuel tank filler cap. Attach fuelrelease tool onto the fuel rail test port, then placethe open end into a suitable gasoline container andproceed to bleed down the pressurized fuel system.

3.3 L engine = 55 PSI (Pounds per Square Inch)Remove the ground cable from the negative battery postand also remove the fuel tank filler cap. Attach fuelrelease tool onto the fuel rail test port, then placethe open end into a suitable gasoline container andproceed to bleed down the pressurized fuel system

Jul 27, 2011 | 1999 Plymouth Grand Voyager

1 Answer

Vw golf 2002 diesel tdi not getting fuel

sounds like the fuel pickup in the tank is no good it controls the fuel gauge.

Jun 06, 2009 | 1996 Volkswagen Golf

1 Answer

Car dies when accelerate. do i need new fuel pump?

It sounds from your description that the fuel pump is weak. To check the fuel pressure you need a fuel pressure test gauge for fuel injection. Attach the gauge to the test port schrader valve and turn the ignition to the on position. Record the reading. Now start the engine and record that reading. Unplug the pressure regulator vacuum line and record the reading.
The pump should have pressure with in specs but if low, start with the installation of a new complete pump. It is located in the fuel tank. Also replace your fuel filter.
Hope this helps you.
RPM Northwest

May 12, 2009 | 1999 Ford Crown Victoria

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