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89 f350 /460/TBI wont run unless Injector manifold return line pinched off... any thoughts?

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My fuel pressure goes to 60 pounds when the keys is turned on then starts dropping Is it my fuel pump or pressure regulator? 2004 GMC Yukon XL


Fuel pressure may drop due to a leaking injector or bad check valve in the fuel pump itself. The regulator does not come into effect until the engine is running and a vacuum supply is produced to it. If the regulator is leaking internally, it could send fuel back to the tank as well. Prime the fuel line and pinch off the return line ( if possible ) to eliminate a regulator problem. If the fuel pressure drops with the return line pinched off, suspect a leaking injector or fuel pump. If injector is leaking, the vehicle should run rich and cause a hard start/rough run condition

Jul 25, 2015 | 2004 GMC Yukon XL

1 Answer

89 dodge d150 318 tbi turn key to on position gas pours out of injection and fills throttle body in seconds I'm wondering is this absolute proof of complete failure of fuel pressure regulator failure?


89 dodge TBI system - that is NOT proof of the Pressure Regulator failing.
The fuel system will pulse on when the key is turned on to charge the fuel rail for starting. The injector should not leak - probable injector failure (stuck open) - try disconnecting the wiring to the injector (to rule out computer controls) and see if it still leaks with just Key-On. If it still does you can also tap the throttle body case where the injector is - if it stops - definitely the injector (don't damage the throttle body - lightly tap )
You may want to retrieve fault codes before you try disconnecting things and creating new faults. If you don't have a code reader - try Key On - Off - On - Off - On (without cranking) and count the flashes of the engine lite - all two digit codes - usually starts with code 12 (battery disconnected recently) and ending with 55 (end of tests)

Feb 05, 2015 | Dodge Cars & Trucks

1 Answer

Idles, floods under acceleration/throttle movement


The TBI unit is going to be the route of your problem. Clean and inspect the insides of the unit. Next to the injector is the fuel pressure regulator. Either the injector pressure regulator has failed and is leaking, the o-ring that seals the regulator to the TBI has failed, or because of age and time. The housing itself has oxidized or cracked and is letting fuel leak into the throttle body. There are many different ways that the TBI unit can fail. An unmetered amount of air getting into the engine, low or no fuel pressure, or throttle linkage was sticking or broken, then there would be other symptoms. You provided a great description and list of symptoms. Please, when you have time, take a closer look at the TBI unit and let me know. If you have any other questions please write back and I'll do my best, good luck.

Mar 15, 2014 | 1993 Dodge Dakota

1 Answer

How do i decrease the fuel pressure in my 87 pontiac 6000


Unless the return line is somehow pinched off ,you can't ,not sure if this is the TBI 4 cyl. or a v-6 .either way at wide open throttle there should be NO fuel. If there is at WOT possibly TPS

Jun 01, 2012 | 1987 Pontiac 6000

1 Answer

Starter needs to be replaced. Need instruction procedure for a do it yourselfer.


Hi, I have pasted the procedure from autozone.com below. Because this requires removal of the intake manifold, please be as sure as possible that your starter needs replacement. If you have any doubt, please let me know what your symptoms are and what troubleshooting you have done that led you to believe your starter is bad. Also, if you have any questions about the procedure below, please let me know. Thanks for using FixYa.


Removal & Installation


Disconnect the Negative battery cable


Relieve the fuel system pressure (you can do this by placing a rag over the schrader valve on the fuel rail and pressing in the valve stem--just be careful not to spray fuel on your eyes).


Drain the cooling system.


Remove or disconnect the following:


  • Intake manifold heat shield
  • Sight shield
  • Coil module connectors from the coil modules located on the valve covers
  • Positive Crankcase Ventilation (PCV) hose and valve from the valve cover
  • Fuel regulator vacuum tube
  • Vacuum tubes from the AIR solenoid
  • Fuel inlet and return lines
  • Fuel rail bracket retaining nut at the rear lift bracket
  • 2 pushnuts attaching the engine coolant heater wire and set it aside, if equipped
  • Fuel injector electrical connections
  • Fuel rail and injectors
  • Plenum duct clamp at the rear of the intake manifold, loosen
  • Intake manifold bolts and the manifold
Clean the manifold mating surfaces.


Remove or disconnect the following:
Starter electrical connectors Starter motor

jturcotte_1382.gif


Fig. View of starter motor removal and wires



To install:

Install or connect the following:

  • -S- terminal wire. Torque the nut to 35 inch lbs. (4 Nm).
  • Starter electrical connectors. Torque the nut to 89 inch lbs. (10 Nm).
  • Starter motor
  • Mounting bolts. Torque the bolts to 22 ft. lbs. (30 Nm).


jturcotte_1383.gif


Fig. Intake manifold torque sequence- 4.6L engines

  1. Grease the inside edge of the rubber plenum duct.
  2. Position the intake manifold by performing the following sub-steps:
    1. Place the rear of the intake manifold into the plenum duct.
    2. Place the front of the intake manifold downward on to the cylinder heads.

  3. Install the intake manifold bolts and torque to 89 inch lbs. (10 Nm) in the sequence illustrated. DO NOT torque the intake manifold bolts when the engine is HOT or at operating temperature.
  4. Make sure the plenum duct is fully attached to the rear of the intake manifold and tighten the plenum duct clamp to 20 inch lbs. (2.25 Nm).
  5. Install or connect the following:

    Fuel rail and injectors and tighten the rail retainers to 89 inch lbs. (10 Nm) Fuel injector electrical connections Alternator coolant pipe/surge tank pipe and position onto the fuel rail studs Engine coolant heater wire onto the studs and install the pushnuts, if equipped Fuel rail bracket retaining nut at the rear lift bracket and tighten to 89 inch lbs. (10 Nm) Fuel inlet and return lines Vacuum tubes to the AIR solenoid Fuel regulator vacuum tube Positive Crankcase Ventilation (PCV) valve and hose to the valve cover Coil module connectors to the coil modules located on the valve covers Sight shield Intake manifold heat shield Negative battery cable
  6. Fill and bleed the cooling system.

Mar 31, 2011 | 2002 Cadillac Deville

1 Answer

Good fuel preasure,good spark, good compreation, no start, sparkplugs soaked with fuel.


check for a very dirty or clogged air filter, faulty Manifold Absolute Pressure sensor (or Manifold Air Flow sensor), disconnected or faulty Engine Coolant Temp sensor, disconnected or faulty Intake Air Temp sensor, and leaking fuel injectors or a stuck open cold start fuel injector. A pinched or blocked fuel return line from the fuel pressure regulator to the tank is rare but could also be a cause.

Feb 28, 2011 | Toyota Camry Cars & Trucks

1 Answer

I have a chevy 454 BB and it fires on 4365 but not on 1872. timing is correct and its getting spark but just wont run.


Check thr TBI (throttle body injector). The injector on the right side feeds fuel to 4365 thru the intake passages(follow the air flow pattern of the intake manifold). It sounds like you have a bad injector, either not firing or very restriced flow.

Jan 28, 2011 | 1986 Chevrolet K1500

1 Answer

When I try to start it the TBI dumps fuel in the motor and floods


You have a bad injector or a defective throttle control switch. You can test the throttle switch if you have a ohm meter, if you do get back to me and I will tell you how to test it.

Jun 01, 2010 | 1989 Chevrolet S-10 Blazer

1 Answer

No fuel pressure in injectors


If the fuel preessure reg. is on the fuel rail after the injectors before the return line and is clogged fuel pressure will be higher than specs.but will be in the fuel rail.If reg. is before the injectors(as in at the beginning of the fuel rail) and it is clogged then there probably wont be any fuel in the line. I beleive the injectors may be the point of concern.Check the injector fuses first.

Sep 22, 2009 | 1992 Dodge Caravan

2 Answers

89 GMC K2500 5.7L TBI not spraying fuel


have you checked the coolant temp sensor? it controls air-fuel mixture.

Jul 16, 2009 | 1989 GMC K2500

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