Question about 1988 Ford Thunderbird

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2.3L Fuel Pump won't pressure up when hot. ie..running temp.

The fuel pump pressurizes up and engine starts easy when engine is cold. It will run as long as you want. When you shut it off at operating temp the fuel pump won't pressure up and engine won't start. After you let it cool way down, then it fuel pump pressurizes and engine starts and runs very good once again. Until you shut it off at operating temp and then fuel pump won't pressurize. So is this the fuel pressure regulator, or relay? Or the air vain meter assembly? Or the EEC-1V, (engine computer) Coolant temp sensor? Air throttle body? Fuel vapor return line? TPS?
Also the engine will surge and search and go to high rpms. Intermittently.

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  • Brroe Jul 31, 2010

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Hi! I believe that it will be on the Throttle body since it goes on high rpms. It happens when the throttle body fails but once replaced it'll be good. Please write back on the progress. THanks and have a good one!

Posted on Jul 31, 2010

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Hi

Please check the articles bellow to have an indepth knowledge regarding your query…

http://www.ehow.com/about_5031917_fuel-pump-relay.html

http://www.wisegeek.com/what-is-a-fuel-pump.htm

Let us know if you have something more to know else accept the suggestion.
Thank You for contacting Fixya.com

Posted on Jul 31, 2010

  • Brroe Jul 31, 2010

    Where is the relay on this car? How do you jump it to turn the fuel pump on directly?

  • Brroe Jul 31, 2010

    Also where is the oil pressure switch so I can jump the switch when I get stuck on the road?

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Hard to start from hot or cold, imobaliser fitted. Once started runs fine, but takes 5 mins+ and backfires


You should have the fuel system tested , fuel pump pressure an flow test . an static fuel pressure . There is a check valve in the fuel line inside the fuel pump module , this could be bad . You could try just turning the key to run, not start 4 or 5 times to see if this adverts this problem . This will build fuel pressure up , you see when you turn the key on the PCM/ECM -engine computer energizes the fuel pump for two seconds building fuel pressure .

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1991 chevy lumina wont start after sitting when you drive it


Just because you replaced the fuel pressure regulator does not mean it is working correctly; which is the most common cause of your problem. Hook up a fuel pressure guage and watch what happens when you are starting it cold - it should go up to about 47 PSI and once started it should read between 40-47 PSI, then when you turn the engine off: Does the pressure drop? There is a check valve built into the fuel pump also; that can be faulty and if the pressure is generally reading low and the check valve is bad- this can also create your problem. We have run into this before also; When the fuel pump is cold the internal pump seals are sealing great, but after a period of running time the pump seals lose sealing power and if you try to start it again it will be hard to start. The biggest thing with this situation is getting the fuel pressure readings at the following points of time:: Start-up, running cold, running at normal operating temp, engine off, engine re-start.
Pete/ Bambenek Auto LLC

Apr 15, 2014 | 1991 Chevrolet Lumina

1 Answer

Won`t start when cold


No such thing on your car.
The temp sensor tells the computer what the engine coolant temp is.
If it were faulty you would get a check engine light.
I would have the fuel pressure checked before and after you crank the engine. The pump relay provides power to the pump when you turn the key on to recover some of the lost fuel pressure after the car sits. The one way valve in the pump is supposed to prevent the pressure from dropping.
If the fuel pressure drops to zero it could take some time to crank the engine enough to get it back up.

Aug 17, 2012 | Lincoln LS Cars & Trucks

1 Answer

93 chevrolet fuel pump symptoms


fuel, timing and ignition can all be factors plus engine sensors once fuel pump is installed and pressure is correct. ck intake temp sensors they run cold start and choke air intake temp sensor.throttle position sensor.before replacing ecm.

Aug 05, 2012 | Cars & Trucks

1 Answer

My car runs good for awile then it starts loosing power like it is starving for gas i checked the fuel pressure will it was running and it was coming out very slow should it have more pressure then that...


You have to test the pressure off your fuel pump with a fuel pressure gauge. It should have more than 60 psi of pressure, if it's a lot less than that replace your fuel pump. If the fuel pump pressure it's ok, then test the pressure with the fuel preasure gauge after the fuel pressure regulator it must have around 39 psi, if there is a lot more or a lot less, then replace the fuel pressure regulator it cost around $50. If your car works good when it's cold but it starts failing when engine hot, it's pretty certain that you need a fuel pump replace. To corroborate this just test your fuel pump pressure when the engine is cold and then when your engine is hot. It must have the same pressure.

May 14, 2011 | 1997 Mercury Cougar XR7

1 Answer

REplaced fuel pump still won,t start when its cold it starts right up when its hot the only way it starts when cold is relieve pressure from line 1997 chevey pu . 305 .


Check your fuel pump relay Alot of chevy systems back up the fuel pump power supply through the oil pressure sending unit . So even if the relay is NG the vehicle will still start and run because the oil pressure sending unit is feeding the pump . It also could be a combination of bolth a bad relay and the O P sending unit it needs to build up enough engine pressure to trip the switch inside the sender to send voltage to the fuel pump and it would do this much better if it was cold the oil is thicker

Feb 10, 2011 | Chevrolet 1500 Cars & Trucks

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

I have a Silverado 1500, 4.3 with 132,000 miles. After start, it runs fine, no signs of malfuntion. However it takes extended cranking to start. The fuel pump & filter was replaced 10,000 miles ago....


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.

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 and post back pressures. 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.
Do not leave home without it.
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.

Also you mentioned that you replaced the fuel pump, it's common for the $15.00 wire harness from the fuel pump to the frame will break and there is a bad connection till the wires heat up. You can try this trick, turn your ignition on for 30 seconds "engine not running" and then turn it off for for 5 seconds and then try to start. This will energize the fuel line if the fuel line check valve is bad which is a part of the fuel pump and will heat up the wire harness which will make a better connection and see if the engine starts easier. Regardless, inspect the wire harness for corrosion and the ground is good. Good luck and keep me posted.

Dec 15, 2009 | 2000 Chevrolet Silverado 1500

2 Answers

Engine


Check if engine is running too cold or hot on temp gauge.
If so replace the engine cooling thermostat,
it will alter what the computer thinks engine is doing.

Jun 02, 2008 | 1997 Saab 900

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