Question about 1999 Ford Taurus

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What would cause low fuel pressure

What would cause low fuel pressure and cause yiur engine to shut off when it get hot?

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A bad fuel pump causes low fuel pressure.

Consider replacing it. It is located in the fuel tank beneath the back seat.

Good luck.

Posted on Sep 05, 2009

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Also possible is the fuel filler cap might be clogged. (It should have a tiny air vent to let air in as fuel is sucked out).
To test this - after the engine shuts off try opening the filler. If it sucks (literally) that is the problem. Also you could drive a while with it off to see if the problem goes away.

Posted on Sep 07, 2009

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Could be a bad fuel pump or a plugged fuel filter,if u replace the pump,replace the filter

Posted on Sep 05, 2009

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1990 cutlass ciera 3.3injectors are not pulsing injectors ohm out 11.8-12 40lb of fuel pressure wiring to injectors are hot at a loss can the M.A.F.cause a no start it does start with starting fluid


MAF is probably not the problem - sounds like the engine is not getting the fuel it needs to start and either your injectors are fouled or the pressure regulator is stuck - that might cause the hot wires. The fuel pressure seems a bit low, but it should momentarily drop when trying to start the engine.

Mar 09, 2017 | 1990 Oldsmobile Cutlass Ciera

1 Answer

P0313,p008A,p0087 . I don't understand this codes from my Lr4 2010


code p0313 refers to misfire detected---low fuel level===causes-- fuel system ---mechanical fault ( check fuel pressure, fuel filters and fuel pump)
code p0087 refers to fuel rail /system pressure --too low=== causes --fuel pump,--fuel pressure regulator--fuel supply line blockage--mechanical fault. ( have the fuel system pressure tested.)
The code you have listed as p008A is not in the book and you have not given an make or engine model to refer to in other places. I will refer to the code as p0084 which refers to exhaust valve control solenoid, bank 2--circuit malfunction===causes --wiring--exhaust valve control solenoid---ECM ( this will present as a rough running engine or problem starting/ shutting down

Oct 30, 2014 | Cars & Trucks

1 Answer

Motor shuts off when started up,shuts off when driving.


hot engine or cold, or both? 180F+ is hot.
Shuts off, idling or on the fly, say at 30mph right foot down it dies?
just clue here...
engine stalls. is complex. but in the macro its below, using tools finds the reason,, but you never said did it restart easy./??????
1: lost of engine compression hot engine, (or overheated)
2: lost 12vdc electric power at stall (caused it) dash goes dead. ?
3: lost spark, test spark at the failure point. if dead trouble shoot speak.
4 bad fueling, too lean (say the fuel pump dies) or too rich.
too rich causes wet spark plug tips. (lots of causes )
5: stalls due to idle RPM too low, below 800 is too low.
too low idle rpm is caused by many things, but top 2 are.
A: EGR stuck wide open, clean it, as the books shows at 60k miles
B: ISC stuck closed. (same deal clean it)

now repost and say when it stalled,
at a read light or flying up a hill wot, wot= wide open throttle.
and when it dies, is the restart easy or hard.

Dec 05, 2013 | 1997 Jeep Grand Cherokee

1 Answer

Crank sensor


Hot starting problems are usually fuel related. When a hot engine is shut off, the temperature of the engine and everything on it continues to rise for awhile as the engine undergoes a period of "heat soak." This can cause fuel to boil inside the carburetor bowl, fuel lines and fuel filter. When you attempt to restart the engine, "vapor lock" obstructs the flow of fuel and the engine doesn't want to start.
This is much less of a problem on fuel injected engines because the fuel is usually under much higher pressure inside the injectors and fuel line. Even so, a fuel line routed near an exhaust manifold or a fuel rail that's exposed to a lot of heat may still suffer the same kind of problems.
Heat soak problems such as these can sometimes be cured by wrapping insulation around affected fuel lines, and/or installing an insulating spacer or heat shield under the carburetor.
A Seasonal Problem Hard hard starting tends to be a seasonal problem, but may be worse in the early months of spring when refiners are switching fuel blends. Gasoline refiners produce fuel with a slightly lower volatility rating (called "Reed vapor pressure") during hot summer months because lower volatility fuel is less likely to boil and cause hot starting problems. During the winter, they switch to a higher volatility fuel because it makes cold starting easier. But if you still have "winter" grade fuel in your tank when warm spring weather arrives, you may experience some hot starting problems. The problem will go away, however, as soon as the refiners in your area switch to their summer grade fuel.
Other Causes Hot starting problems can also be caused by cooling problems that allow your engine to run too hot (the pistons swell up and may scuff the cylinder walls), or excessive resistance in the starter motor that causes the engine to crank slowly. A starter "amp draw" test can be used to check the condition of your starter. Also, many starters have small "heat shields" to protect them from heat radiating from nearby exhaust pipes or manifolds. If the shield is missing, the starter may get too hot and bind up.

Oct 20, 2013 | 1995 Mercury Cougar

1 Answer

Engine shuts down after driving about 20 miles let cool down for 10 min. and it will go again


You didn't say whether or not the car is running hot so I'm guessing here. If it is running hot then the temp switch could shut it down for obvious reasons. So could the oil pressure switch. The oil pressure switch will shut your engine down if the oil pressure drops below a certain point. This is caused by lack of oil pressure. Lack of oil pressure can be caused by low oil level, weak oil pump or oil too thin to lubricate. If the engine is running hot that can thin out the oil to the point of no use to the engine. If you have a high mileage engine and are still using 5W30, 10W30 oil then try upgrading to 10W40, 15W40 or even 20W50.

Your engine could be running lean which would create a hot situation that would cool fairly quickly. If this isn't adressed you can look at catastrophic engine failure in your future.

You could also be looking at an internal problem such as warped heads, bad head gasket, worn out oil pump.

If it was my car, I would be taking to someone to find out the exact reason it is doing this. I would likely take it home and fix it myself but I think you should have a professional diagnose this more accurately. Hope this helps.

Oct 29, 2011 | Cars & Trucks

1 Answer

2002 pt cruiser code p0172


DTC P0172 - P0172 Fuel Trim System Rich Bank 1... this indicates that the fuel mixture is too rich, but you already know it is running rich.

A rich fuel mixture can be caused by a number of things First, I would suggest checking fuel pressure to make sure it is within normal specs If fuel pressure is too high due to a faulty pressure regulator for example, it will cause too much fuel to be entering the engine.

A leaking fuel injector can cause a rich fuel mixture, as can an injector that is stuck in the open position. When the engine is shut off, monitor fuel pressure with a fuel pressur gauge; it should remain steady.If fuel presure drops when the engine is off, then removing the fuel rail and injectors while still connected to the lines to visually check for a dripping injector may be informative.

There are several engine control system problems that can cause a rich fuel mixture; if you can obtain a scan tool that is capable of displaying live engine data you can check for these possible causes:

1) Low MAP reading; this can be due to a fault in the MAP sensor, MAP circuit, or as a result of low engine vacuum due to a restricted exhaust, jumped timing belt, or low compression on one or more cylinders caused by valve leakage or a leaking head gasket. Compression testing the engine may reveal internal mechanical problems of this type that would cause low engine vacuum. A low engine vacuum reading from the MAP makes the computer think the engine is under heavy load such as during acceleration, so it commands a rich fuel mixture in response. A vacuum leak can also result in a rich mixture for the same reason.

2) Low coolant temperature signal. This can be caused by a fault in the coolant temperature sensor circuit, faulty coolant temperature sensor, low engine coolant level, or a faulty thermostat that is allowing the engine to run too cold.

Keep us updated.

Oct 03, 2011 | 2002 Chrysler PT Cruiser

1 Answer

Started ran for awhile then died an wont start


Start with the simple and replace your fuel filter, a dirty filter can cause your engine from starting. At worst, your fuel pump has failed and will need to be replaced. Before replacing the fuel pump, inspect all the fuses and wire leads from the fuel pump harness. Note: that the ground wire is separately grounded at the frame, so inspect that for any damage due to corrosion.

You need 3 things.
Compression
Good hot blue spark to all plugs.
Good gasoline and proper fuel pressure. 63-64 lbs.
If you have all 3 then move on to injector pulse to all injectors. I think each injector is on a seperate driver on that one. Check for pulse to all of them.

You may be weak on fuel pressure, even a couple of lbs low on a cold start will cause a no start. Double check cold start cranking fuel pressure. If under 63-62 lbs you have problems. One test is to give it a squirt of carb cleaner not starting fluid. If it starts then you have a fuel pressure problem.
Run the full fuel pressure test, here is the guide lines on testing.
Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure. Later V6 and V8 gm engines should have 60-66 fuel pressure.
* Cold start should be 64-65 lbs of pressure. If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
* Engine running should be 60-66 lbs pressure depending on engine load.
* Full pressure with return pinched off should be 75-85 or more. and if it has a fast leak down after shut off you have a leak.

The 75-85 is only a check on the capable full pressure of fuel pump. If you can not find the rubber return line check full pressure by plugging return line or just or the true full pressure can be taken direct at the end fuel filter.

Mar 18, 2010 | 1999 GMC Sierra

1 Answer

Hard to start when cold once the engine is started it will start fine this only happens after it sits overnite


The most likely cause is the fuel pump unit. The fuel pmp has a check valve that is supposed to hold fuel pressure on the fuel rails after the engine is shut off. when this check valve leaks, it allows the fuel from the fuel tank to drain back into the tank. Then, when you go to start uour car, the fuel has to travel the full length of the car, and build up enough pressure to spray through the injectors before the engine will start.

The fuel pressure regulator can cause similar symptoms, but is not as likely to fail as the check valve in the fuel pump and will be much worse after a short hot-soak. (Shutting the engine off hot - for about 5 to15 minutes)

Oct 18, 2009 | 1997 Pontiac Grand Prix

1 Answer

My 2002 pontiac grand am lately has been turning over, but won't fire up. then randomly a while later, it starts up fine. the security light doesn't blink when the key is in the ignition. what are my...


The most likely cause is the fuel pump unit. The fuel pmp has a check valve that is supposed to hold fuel pressure on the fuel rails after the engine is shut off. when this check valve leaks, it allows the fuel from the fuel tank to drain back into the tank. Then, when you go to start uour car, the fuel has to travel the full length of the car, and build up enough pressure to spray through the injectors before the engine will start.

The fuel pressure regulator can cause similar symptoms, but is not as likely to fail as the check valve in the fuel pump and will be much worse after a short hot-soak. (Shutting the engine off hot - for about 5 to15 minutes)

Oct 17, 2009 | 2002 Pontiac Grand Am

1 Answer

Car would not start so replaced battery, then alternator; Ran great for roadtrip then shut down on the freeway. Can hear the fuel pump, so replaced the fuel filter; has spark. Has fuel. Wires are in good...


WHEN A CAR SHUT DOWN ON HIGHWAY OR FREEWAY.YOU CAN STILL HAVE FAULTY FUEL PUMP.IT COULD BE RUNNING BUT THE FUEL PRESSURE CAN BE TOO WEAK.THE 2.5 ENGINE FUEL PRESSURE IS 6.0 TO 7.0 PSI AND THE 3.3 ENGINE FUEL PRESSURE IS 37 TO 43 PSI. ANOTHER THING CHECK TO MAKE YOUR COOLANT IS NOT LOW.LOW COOLANT CAUSES ENGINE GET TOO HOT SHUT OFF.CHECK PVC VALVE AND EGR VALVE MAKE SURE THEY ARE NOT STUCK OPEN OR DISCONNECTED.AND MAKE SURE IDLE SPEED IS NOT TOO LOW YOU IDLE SPEED IS ON THE FACTORY STICKER UNDER THE HOOD.

Sep 28, 2009 | 1990 Oldsmobile Cutlass Ciera

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