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The up28 vacuum pump keeps running after car is shut off is any thing wrong with it

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Posted on Jan 02, 2017

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SOURCE: Gmc Arcadia runs fine until I put gas in it. It is

there must be a blockage in the crank case vent /pipe, probably, you could try tightening the fuel tank cap a bit more after filling up , i know this sounds a bit dodgy but you could have a weak seal and the EVAP system is recording emission to atmosphere , otherwise get the OBD CODES READ TO SEE IF THERE IS A FAULTY SENSOR/SWITCH

Posted on Jun 27, 2014

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1 Answer

The up28 vacuum pump stayed running after the car was shut off and it was very hot is there any thing wrong with it


I had the same issue, reason Of the vacuum pump to work continuously is either a leak in the vacuum pipes btween the pump and master cylinder or "which was my case", the vacuum switch or sensor between the master cylinder and vacuum pipe is not functioning properly. Replaced and everything works fine.

Mar 28, 2015 | 2007 Volvo S40 2.4i Sedan

2 Answers

Is it a safty feature that shuts engine off after new ingnetion. runs good 10 mins,


There is a little module on the ignition key that talks to the computer. If that got changed, you must reprogram the computer (dealer only). There is a roumer that there is a way to get things running enough to drive to the dealer. Has something to do with waiting ... maybe 1/2 hour. BTW, it is a security feature so someone can't steal your car.

Jul 10, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Gmc Arcadia runs fine until I put gas in it. It is hard to start I have to disconnect the vacuum line from crank case. Then it will start put it back together and is fine until I get gas again. The vacuum...


there must be a blockage in the crank case vent /pipe, probably, you could try tightening the fuel tank cap a bit more after filling up , i know this sounds a bit dodgy but you could have a weak seal and the EVAP system is recording emission to atmosphere , otherwise get the OBD CODES READ TO SEE IF THERE IS A FAULTY SENSOR/SWITCH

Jun 27, 2014 | Cars & Trucks

1 Answer

Car starts and runs for a while then shuts off while running. What could be wrong?


Some fault code or check engine light there? Scanned the computer to know if some is stored.

I suggest to check fuel system (injectors, fuel pump pressure, etc), also air intake sensors and ECT (temperature) sensor.

Keep us updated.

Feb 16, 2012 | 1996 Acura RL

1 Answer

My fuel pump on my 99 cougar v6 only runs for a half second then shuts off I've replaced the filter , the pressure regulator valve , the pump and it still does the same thing . could I have a ecm prob


Generally, the computer only runs the pump long enough to start the engine and build oil pressure. After that, the oil pressure switch keeps the pump on, most of the time by supplying a ground to the fuel pump relay. This is a built in safety thing, when the engine isn't running, the fuel pump shuts off. Most public libraries have Chilton's manuals, or you could pick up a Hayne's manual at a store like Autozone. These books can help you locate the relay and oil pressure switch, as well as provide wire colors for your specific vehicle.

Nov 13, 2011 | Cars & Trucks

1 Answer

Code 1457


P1457 is the EVAP canister system, including the popular vent-shut valve underneath the left-rear seat. Check out this thread, I put something towards the bottom.

P1457 won't make the car run bad at all. It just means the EVAP canister & the related system of hoses & valves isn't airtight.

Check this stuff in this order. As soon as you find something that doesn't behave like it should, fix or replace it. Then hope it was the only thing wrong with the system...

Some background for the electrical troubleshooting:
All the solenoid valves have constant +12v supply from the main relay. When the ECM wants to energize a valve, it closes the ground side of it's circuit. If the +12v supply is broken, then the ECM can't energize the valve. If the wire to the ECM is shorted to ground, then the valve is energized even when the ECM doesn't want it to be.

EVAP Purge Control valve - between intake manifold & valve cover.
Valve should be normally closed, so it will hold vacuum when it's not energized. Ground is supplied by pin A6 of the ECM to open the valve. So jumper pin A6 to ground, turn on the ignition, and check again - this time it should NOT hold vacuum.

EVAP 2-way valve - underneath the car roughly under the left-rear seat.
It's a little can with 3 hose barbs & a solenoid valve attached to it. Leave the connection on top, disconnect both on the side, attach MityVac to lower one. Normally open, when the solenoid valve is energized, it should hold vacuum.

EVAP Vent Shut valve - attached to the charcoal canister underneath the car.
Normaly open - when ECM closes pin A4 to ground, it should hold vacuum.

EVAP Charcoal Canister - the big can under the car, about under the left-rear seat.
Leak test: Connect all the hoses together, plug the Vent Shut valve, connect the MityVac. Pump vacuum while watching the fuel tank pressure (FTP) sensor. You can read FTP sensor voltage with a scan tool, or use a voltmeter between pins A29 & C18 at the ECM. Pump down to 1.5v & it should hold that vacuum for at least 20 seconds.

EVAP 2-way valve vacuum & pressure test.
If you get this far you'll want the manual for a good picture of how to connect the hoses. Keep pumping the vacuum pump & it should stabilize between 6 & 16 mm Hg of vacuum. Then pump pressure, it should stabilize at 8 mm Hg or more of pressure.

Then there's a test of the ORVR Vent Shut valve, which is located on top of the gas tank. You check vacuum & pressure at a couple hoses alongside the fuel filler pipe. If the valve is bad you drop the gas tank to replace it...

__________________

Feb 08, 2010 | 1999 Honda Civic

1 Answer

My 1991 chevy 4.3 s-10 pickup wont start or stay running


check the fuel preasure regulator, using a vacuum pump check the unit and see if it holds vacuum if not replace unit

Sep 27, 2009 | 1991 Chevrolet S-10

3 Answers

2004 Ram 3500 5.9 Diesel, Vacuum pump on almost all the time


It runs the cruise control, the heater controls usaully, and possibly something else. I would be looking for a leak in the resevoir, or a vacuum line.

Jun 09, 2009 | 2004 Dodge Ram 3500 Truck

1 Answer

Durango shuts off when im driving and than won't restart


This could be a number of things. First thing is do you have a check engine light on? If you do, I would have the codes read. That will tell you exactly what is wrong. And it is free-cheap to have them read.
If anything electrical or sensor wise is bad, the check engine light should be on.
Otherwise it would be a vacuum problem or a clogged fuel filter, possibly a failing fuel pump will also cause this problem.

May 22, 2009 | 2000 Dodge Durango

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