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What is the fuel pressure at the injectors and the recommend fuel line pressure

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Generally it's between 50 -70 psi, in most cars.

Posted on Dec 03, 2014

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Generally speaking, modern gas fuel injected systems average 30-40+ psi. Older carburator engines only required 3-7 psi. High pressure in the injector helps atomize the fuel for better air-fuel mix. Check maufacturers specs and use proper tools to measure fuel pressure. Eye protection recommended.

Apr 24, 2016 | Cars & Trucks

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Fuel injectors not shooting out fuel 93 gmc c1500 5.7

I would make sure your fuel pump is fully operational and is pushing the recommended pressure of 35 psi. You will need a fuel pump pressure gauge (tester). I would start here and them move forward.

Mar 08, 2014 | GMC K1500 Cars & Trucks

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Can anybody tell me how to change fuel injectors on 1989 audi 200 quattro?

first relief fuel pressure before disconnecting fuel lines remove fuel pump fuse or relay start engine let it idle until stall out lack fuel fuel now fuel pressure is reliefed. you have to remove top upper air cleaner housing, you have to remove whole entire air cleaning system because the fuel lines with fuel injectors is under the air cleaner filament you have to remove entire fuel line with fuel injector in order to replace fuel injector.

Nov 21, 2011 | Audi Cars & Trucks

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How do you install injectors in a chevy s-10 pick-up?

Removal & Installation

Exploded view of the fuel rail and injector mounting

Take care when servicing the fuel rail assembly to prevent dirt or contaminants from entering the fuel system. ALL openings in the fuel lines and passages should be capped or plugged while disconnected.
  1. Before disassembly, clean the fuel rail assembly with a spray type cleaner such as AC Delco® X-30A, or equivalent. After removal, DO NOT immerse the fuel rail in liquid solvent.
  2. Properly relieve the fuel system pressure and disconnect the negative battery cable.
  3. Remove the air intake duct, as necessary for access.
  4. Tag and disengage the fuel injector electrical connectors.
  5. Disengage the fuel pressure regulator vacuum line, then tag and disengage all other necessary vacuum hoses.
  6. Loosen and remove the fuel rail retaining bolts.
  7. If necessary to remove the fuel rail assembly completely from the engine compartment, or to prevent stressing and damaging the fuel lines, disconnect the fuel lines from the rail assembly.
  8. Carefully lift the fuel rail assembly and fuel injectors from the intake.
  9. Carefully release and separate the fuel injectors from the rail assembly.
  10. Remove and discard ALL old O-rings from the fuel injectors and, if disconnected, the fuel lines.
To install:
  1. Lightly coat the new O-rings with clean engine oil, then position them to the injectors and, if applicable, fuel fittings.
  2. Install the injectors to the fuel rail assembly.
  3. Carefully install the fuel rail and injectors to the intake manifold. Make sure the injectors are properly seated in their bores, but DO NOT force them into position.
  4. Install and tighten the rail retaining bolts to 62 inch lbs. (7 Nm).
  5. If removed, connect the fuel lines to the rail assembly and secure the fittings.
  6. Engage the fuel pressure regulator and any other vacuum lines, as noted during removal.
  7. Engage the injector electrical connectors.
  8. Connect the negative battery cable and cycle the ignition switch (without attempting to start the engine) in order to pressurize the fuel system, then check for leaks.
  9. Install the air intake duct.

Apr 25, 2010 | 1992 Chevrolet S-10

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Starts when you spry starter fluid runs till fluid gone pump does run

Well you've got it narrowed do to a fuel issue. And you can hear the fuel pump running? Now I guess you just got to figure how far the fuel is getting. I'd recommend checking the fuel pressure on the fuel lines. On the motor, above the injectors is the fuel rail. Somewhere on it, there is a little valve. Turn the key forward to activate the pump, and check your fuel pressure here. It should spray out hard if you press the inner valve stem for a second. If the fuel does not have good pressure here, then you likely have a bad fuel pressure regulator, a clogged fuel filter, or a weak pump. If the fuel pressure here is good, then you should be looking at the injectors. You can use a long screwdriver, or better yet a mechanics stethoscope (available at harbor freight tools for like $5) to listen to the injectors. There should have a steady series of clicks within as they open and close as designed. Any sound outside the steady clicks or no clicks at all designate a poorly operating injectors.

Good Luck, FixYa will be here to help with the next step, should you need it, come on back....

Mar 26, 2010 | 1998 Dodge Caravan

1 Answer

Where is the fuel filter on a 1994 toyota camery

Under the hood, on the drivers side, front side of strut tower, mounted on fenderwell in fuel line. Use caution as pressure is in the lines unless you bleed it off, or run the vehicle for a moment with the fuel pump disconnected to use up the fuel in the line.

I recommend that you fill the new filter with Fuel Injector Cleaner, about half way, this will give you an excellent injector and fuel system cleaning during the first minute or two of running. Can cause a minor sputter, car will run fine in a few moments once fuel flow is fully established and air is removed.

Mar 06, 2010 | 1994 Toyota Camry

2 Answers

How to tell if a fuel pump is bad

you wont have fuel pressure at the engine fuel line, and you won't hear it pumping in the tank.that is the power to it is good via fuse etc.

Jan 09, 2010 | 2005 Ford F-150

1 Answer

Injectors for 1989 honda accord removing and installing

Detach the cable from the negative battery terminal (if you have an anti-theft radio, make sure you have the code to reactivate it.).
Relieve the fuel pressure (take the gas cap off, and loosen service bolt at the top of the fuel filter; you will need two wrenches for that, on to hold the fitting and the other to loosen the nut; make sure you have a towel or something to catch the gas spill). You could, instead, just SLOWLY loosen the pressure line at the right end of the fuel rail (facing the car).
Remove the air cleaner assembly (take the top off, take out the filter, detach all hoses, take out retaining bolts, and remove).
Unplug the injector connectors (CAREFULLY detach the clips first; just pry them back out of their notches; try not to pop them off and drop one, they are hard to find once dropped).
Detach the vacuum hose and fuel return hose from the fuel pressure regulator (left end of the fuel rail, if you are facing the vehicle)
Detach the two ground cables from the intake manifold (in the middle, under one nut)
Detach the fuel lines (already did left one; detach the pressure line at the right end of the fuel rail).
Remove the mounting nuts (four) and detach the fuel rail and injectors from the intake manifold.
Remove the injectors from the fuel rail and remove and discard the seal rings (top and bottom; the second ring down on the top is the cushion ring and does not need to be replaced, but it is recommended. Most kits contain them)
Coat the new o-rings with fresh oil and slip them on the injectors (or, if you are replacing the injectors they probably came with o-rings on them. Just coat them with oil)
Place each injector into its corresponding bore in the fuel rail (doesn’t matter which is which if you are replacing them all).
Coat each new bottom seal with oil and press it into the injector bores in the intake manifold.
Install the injector and fuel rail assembly on the intake manifold. Make sure the centerline of the electrical connector on each injector is aligned with its corresponding mark on the intake manifold (little arrows, I think). Tighten the fuel rail nuts to the specified torque (17 lbs)
Reverse removal procedure for the rest.
After all is done, turn the ignition on, but do not start the car. This will build up pressure in your fuel lines. Do that two or three times, then check to see if you have any leakage around the injector, or other fittings, before you start the car.
Then you’re done.
Hope this gets you through it.

Nov 08, 2009 | 1989 Honda Accord 4 Door

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

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