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93 dodge van dies,but runs if i unhook vacuum lines what would cause this.also shouldn't it die when I undo the fule pressure regulator

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  • Dodge Master
  • 1,335 Answers

Have you checked your air filter ? It may be dirty or some section of your air intake tubes clogged. This may be why it run when you disconnect a vacuum line.

As for your fuel pressure regulator matter, as long as there is fuel going to the rail and injectors, it may continue to run.

If you can add more detail information of your problem and what have you done in the form of diagnosis, it would help.

Posted on Dec 18, 2016

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SOURCE: dodge spirit starts then dies

Fuel burned out of the bowl? A 95' with carburetor ? Wrong year or what?

Posted on Nov 23, 2008

  • 92 Answers

SOURCE: fuel pressure regulator had no vacuum line connected

another engineers wet dream. think of it this way . what is normally in the intake when the engine is running.. answer vacume, hence the regulator gets its vacume without a hose connected to it as its already in a full time vacume chamber.no hose required . ps be carefull to seat the regulator and o rings securely into the housing befor you reattach the secureing metal clip.
good luck chris

Posted on Mar 23, 2009

  • 335 Answers

SOURCE: fuel leaking into vacuum line on fuel pressure regulator

If you have fuel on the vacuum side of the reg, that means the reg is leaking,causing a variaty of drivabiliy problems. Replacing this reg is very straight forward. Just add a little lube to the O-ring on the reg before installation. Good luck.
Yours Moe.

Posted on Apr 23, 2009

polarcycle
  • 1392 Answers

SOURCE: vacuum line for fuel pressure regulator 98 Tahoe

Was there a hose on the old one? If not, you don't have one. It is most likely your fuel pump if you are not getting fuel.

Posted on May 31, 2009

collegetutor
  • 125 Answers

SOURCE: vacuum lines

Hello, I have the 1993 Ford Festiva shop manual in front of me. The vacuum hose on the Fuel Pressure Regulator goes to the intake manifold. The manual says that the fuel pressure is maintained at a constant 36.3 psi, and when the engine vacuum drops (caused by high fuel demand) it causes the fuel pressure to increase inside the regulator. There should be a vacuum diagram on the bottom side of the hood that will help to show you what vacuum port on the manifold that it attaches to. If the decal is gone, look on the intake manifold for a vacuum port that is open and causing a vacuum leak. I hope this helps.

Posted on Oct 16, 2009

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I have a 2000 ford explorer limited edition 5.0L V8.. The vehicle starts fine but after a while at idle it will sometimes die slowly.. if i put it in gear it also wants to die out. if I hold my foot on...


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1992 toyota celica gt 2.2 starts runs rough then dies


Sounds to me like the fuel pump is worn out. They DO wear out. And even though they seem to be working, the brushes in the electric fuel pump may not be contacting all the commutator, thus making the pump weak. It may start the motor but can't maintain normal running pressure (27-35psi). Have you run the car out of gas shortly before this problem surfaced? If you have then it's your fuel pump. It was damaged when the tank ran dry. Even though the pump may seem to be working, it's still badly damaged and needs to be replaced.
Just as Matmenzies has stated, get a fuel pressure gauge and test the pressure. I'd start with a complete check of all your vacuum lines. Check for cracks on the vacuum hose that connects to fuel pressure regulator on the fuel rail. Also, if you can, get a hand operated vacuum pump to check the regulator. If you can place a vacuum on the regulator and it holds, I'd say move on the fuel pump and check it.
BTW, if the fuel filter has been changed, you may want to check to see if it was installed backwards! Some fuel filters are valved and will cause symptoms like this. However, this is an immediately noticeable mistake and you haven't provided enough info for me to say more. I'd pull it and check that it has any flow at all. You could have sucked in a big dirt ball and blown it right into the new filter, effectively stopping fuel flow. Then I'd blow out the fuel lines, just to be sure.
Start with these 2 things and post what you find. We'll go from there.

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