Will not stay running

ALLENTHERESALAND

MEMBER
1999 MERCURY MOUNTAINEER
160,000 MILES

I can start up the Mtneer and it will run smooth for about 5 to 10 seconds then it dies like it is out of gas. The tank is full. Several months back I put a tank full of bad gas in it and ended up changing the fuel filter because it was clogged. I have ran injector cleaner through the system since. The ODBII is not showing any codes. Acts like a fuel system problem still. Changed fuel filter again to be sure. Clean fuel.

I'm at a loss. Thinking maybe pressure regulator. Any Help?

4 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

It could be a failed fuel pump. Have the pressure checked from a shop and give you a bid.

Roy

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Saturday, October 8th, 2011 AT 7:07 PM

JEFWF

MEMBER
1 POST

Have a 1997 mountaineer with same problem just replaced pump still have same problem what is resistance of secondary coil mine are 12.59k to 12.79 is that good?

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Saturday, October 8th, 2011 AT 7:51 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

What coil are you talking about? If you are referring to the fuel pump, the resistence could be good but the motor may be seized.
You need 12 volts to the pump. If you can verify the voltage is 12 then the pump has failed.
If not, then you need to find the failure.

Roy

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Saturday, October 8th, 2011 AT 8:01 PM

ALLENTHERESALAND

MEMBER
2 POSTS

Well finally the intermitant problem became constant. It will start, run for 10 seconds to two minutes and then die like it is out of fuel. Ran pressure check on fuel. Starts at about 60 PSI, then Idles down to between 35 and 45 psi, then will drop to zero and the vehicle dies. Voltage to fuel pump is good, Fuel pump seems to be working fine. Could the regulator be bad and how would I check it?

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Thursday, December 8th, 2011 AT 4:21 PM