Question about 1991 Chevrolet Lumina

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1991 Chevy Lumina 3.1L V6. Where is the fuel injector pressure regulator located? I was told it was by the throttle body, but once part was removed parts store told me it was NOT the regulator but failed to tell me what it was. Please help.

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  • Chevrolet Master
  • 14,036 Answers

ITS IS NEAR THROTTLE BODY.UNDER THE PLENUM.THE SHRAEDER VALVE TEST PORT IS IN LINE WITH IT.VACUUM LINE FROM THROTTLE BODY CONNECT TO IT.

Posted on Apr 24, 2010

  • Jonah Oneal May 16, 2010

    FUEL PRESSURE REGULATOR UNDER THE UPPER INTAKE PLENUM.ITS THE TOP COVER OVER INJECTORS THE COVER HAS 3.1 MULTI PORT FI WROTE ON IT.

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2 Answers

I have a 1991 Isuzu Rodeo with a V6. When I take the air cleaner off I can see gas leaking from some sort of modulator or something just to the right at the very top.


which engine?
The V6 , it has a real name.
there were 3 v6s used.
what displacement?
sounds like the 3.1L GM V6, not the isuzu 3.2. (2 kinds too)
The GM is the LG6 engine, GM name.
the last carb car , in USA was ISUZU, in 1994.
and before that some very odd , electric carbs. (avoid those)
in 1991
there were 4 engine (1 I4 and 3 V6)
ONLY the 2.3L 4 banger was carb , 2 barrel;
the 3.1L is and was, TFI , so is NOT A CARB.
This TFI has a Real ECU, (EFI system)
and the injector does have seals and can leak.
buy a seal kit and put it in,.
TFI means throttle body injected, x2 in this case
the book shows how to do this, (at mitchells) log in, and read?





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the steps. are clear.
he engine is equipped with 2 fuel injectors; both are located in the throttle body.
  1. Relieve the fuel pressure. (ask)
  2. Disconnect the negative battery cable.
  3. Remove the air cleaner.
  4. At the injector electrical connectors, squeeze the 2 tabs together and pull them straight upward.
  5. Remove the fuel meter cover and leave the cover gasket in place.
  6. Using a small prybar, carefully pry the injectors upward until they are free of the throttle body.
  7. Remove the small O-ring from the nozzle end of the injector. Carefully rotate the injector's fuel filter back-and-forth to remove it from the base of the injector.
  8. Discard the fuel meter cover gasket.
  9. Remove the large O-ring and back-up washer from the top of the counterbore of the fuel meter body injector cavity.

Dec 03, 2016 | Isuzu Cars & Trucks

1 Answer

I HAVE A 1991 CHEVRLLET LUMINA 3.1L V6 MULTI PORT FI, IT WILL START AND IDLE BUT WHEN I GO TO ACCELLRATE IT STALL'S, I HAVE CHANGED THE, MAP SENSOR,CRANKSHAFT POSITION SENSOR, FUEL PUMP, FUEL REGULATOR,...


Possibly the throttle position sensor. Or maybe you are having a problem with the fuel injectors. I would have the fuel pressure checked for proper pressure-that's the point of replacing the pump: proper pressure is critical for good driveability. Replacement pumps, particularly aftermarket, can sometimes not perform adequately.

Aug 28, 2013 | Cars & Trucks

1 Answer

96 Lumina 3.1 won't start. It runs when I spray starting fluid in the throttle body. It has 42psi fuel pressure at the fuel rail. Is it bad injectors?


It is not bad injectors, it is lack of injector electrical pulse, never would all the injectors fail at once. See if you have 12 volts (use a 12 volt probing test light, avail at any auto parts store for less than $5) to one wire of the two wire connector of each injector with the ignition key in run position. If the test shows no hot wire at the injector connectors then check fuses marked ECM1 and ECM2 in the under-hood fuse block. If they are popped then you have a shorted harness or component.

Jun 27, 2012 | 1993 Chevrolet Lumina

1 Answer

I have a 1993 chevy lumina. will not start, has good fuel pressure, good spark, it will start if i put fuel in the throttle body then dies when the fuel burns up cant figure it out


check for injection pulses at the injectors.
Each injector has two wires, one is a supply (12Volt) and the other is grounded by the engine management unit. The switching is very fast so you would not detect it with a test light. Try a multimeter set to frequency. If you check the supply to the injectors, disconnect ALL of them at once. You should have power to only one wire at each injector plug. If no power is present, check the fuel system relays and fuses.

Mar 10, 2011 | 1993 Chevrolet Lumina

1 Answer

Where is the fuel regulator 98 chevy V6 pick up


The fuel pressure regulator is located under the upper intake plenumn. (The black plastic cover that sits on top of the intake manifold)
After removing this upper intake, the regulator will be on the back side of the fuel injector inlet housing.
Good luck

Apr 01, 2010 | 1998 Chevrolet C1500

3 Answers

What is the tps and where is the fuel pressure regulator


TPS throttle positioning sensor......Located on the throttle body and looks like this pic attached Top pic is TPS and Other is the regulator



Fuel pressure reg 4.3L Engines
  1. Properly relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Remove the upper intake manifold.
  4. Remove the fuel pressure regulator retainer clip.
  5. Twist and pull the fuel pressure regulator in order to remove the regulator from the housing using a shop towel to catch any spilled fuel.
  6. Remove and discard the regulator seal O-ring.
  7. Remove and discard the regulator filter.
  8. Remove and discard the regulator seal O-ring.
  9. Remove and discard the backup ring.
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Nov 20, 2009 | 2002 Chevrolet S-10

1 Answer

Fuel pressure regulator


Two places to look...if you have separate injectors for each cylinder then regulator should be at the front end of the fuel rail. If you have throttle body injection it is on the throttle body itself.

Jul 30, 2009 | 1997 Chevrolet Blazer

2 Answers

Adjusting fuel pump


If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.

Jul 12, 2009 | 1991 Isuzu Rodeo

1 Answer

What two coolant lines connect to the throttle body on a 3.1 multi port engine


There are no coolant lines connected to the throttle body, just the two fuel line. The high pressure side and low pressure side (Return line) and I believe the lines don't even connect to the throttle body on a multi port engine, the lines go to the fuel rails to the injectors.
Good luck

May 24, 2009 | 1993 Chevrolet Lumina

1 Answer

1999 chevy blazer fuel problem


probably not fuel filter . probably going to have to remove the upper intake and replace the fuel injector spider(fuel inj assebly) if it is droping fuel pressure it is leaking into the upper manifold

Nov 29, 2008 | 1999 Chevrolet Blazer

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