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1998 pontiac sunfire 2.2 litre fuel pressure check port

Hello,
where do you connect your fuel pressure guage on this car's fuel rail I see no connecting port on the rail at all?

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Hey
You disconnect the fuel supply line at the fuel rail and tee your gauge into it.

Posted on Mar 19, 2009

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How to check fuel pressure on99 sunfire with 2.2 4 cylender


There is a fuel pressure test port on the top of the engine in the pipe )also called the rail) that sits over and supplies fuel to the fuel injectors. You will need a special test gage to hook up to the test port valve. Below is a picture of a typical GM fuel supply rail and test port.
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Feb 28, 2017 | Cars & Trucks

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How do you test the fuel pressure


is this and EFI car, or CARB engine, 1990 (USA ) is a transition year.
my guess is USA< EFI.
with a fuel pressure gauge,
we do all 6 tests listed in the FSM. book.
but here are 2.
key on cranking presssure.
idling presssure.
if MPI enigne (engine not stated) we check while gunning the throttle.
test 3.
then leak down tests.
and injector balance tests.

with this.
http://www.harborfreight.com/fuel-injection-pump-tester-92699.html

method varies by , 1.6L or 1.8L engines.

some cars have a fuel RAIL, MPI engines there is a test port there.
on some cars the fuel filter has fuel test port.

last but really first, is the engine, which is it>?>>???
those are TOY name,, see that 4A >?
the L01 and LWO are GM names for the the engine
the FE means fuel injected engine.
  • Geo Prizm base model (based on Toyota AE92 chassis) 1989-1997
sadly there is no, fuel rail fitting, (you'd have make one)
the FSM shows removing the fuel filter. output. line
and connection the guage there.
The fuel pressure should read 38-44 psi
key on pressure not running.
RAIL method beats all test. bar none !
and is.
running would be about 5PSI less. from what you got above.
if not a drop running, the FPreg (FPR) is bad. or
you lost vacuum to it. the vacuum of the running engine
drops pressure,.
that is just 2 tests. there are more , ask.
on my cars lackng rail fittings, i add a Schrader valve, (fuel rated)
from summit racing.

any thing you do here, must be rated for 75PSI,
no funky carb lines. hose and what not are going to work. here.

Jun 06, 2014 | 1990 Geo Prizm

2 Answers

Fuel pressure 1998 jeep grand cherokee 4.0 L V6


You should have a test port on the Fuel Supply rail, use a tool from a local auto parts "Tool Loaner program" where you can borrow tools for free,w/a deposit of course,then follow the steps provided;

MPI Fuel System Pressure Test

The MPI fuel system used in vehicles equipped with a 4.OL engine employs a vacuum balanced pressure regulator. Fuel pressure should be approximately 55-69 kPa (8-10 psi) lower with the vacuum line attached to the regulator than with the vacuum line disconnected. System fuel should be 214 kPa (31 psi) with the vacuum line connected to the regulator and 269 kPa (39 psi) with the vacuum line disconnected. CAUTION: Some fuel may be discharged when connecting fuel gauge to fuel rail.
  1. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to test port pressure fitting on fuel rail (Fig. 7).
  2. Remove vacuum line from pressure regulator.
  3. Start the vehicle.
  4. Note gauge reading. With vacuum line disconnected, fuel pressure should be approximately 269 kPa (39 psi).
  5. Connect vacuum line to pressure regulator. Note gauge reading. Fuel pressure should be approximately 214 kPa (31 psi).
  6. If fuel pressure is not approximately 55-69 kPa (8-10 psi) higher with vacuum line removed from regulator, inspect pressure regulator vacuum line for leaks, kinks or blockage. CAUTION: Fuel pressure will rise to as much as 655 kPa (95 psi) when the fuel return tine is pinched shut, shut engine down immediately after pinching oft fuel return line.
  7. If fuel pressure is low, momentarily pinch shut the hose section of the fuel return line. If fuel pressure remains low, inspect the fuel supply line, fuel filter, and fuel rail inlet for blockage. If fuel pressure rises replace fuel pressure regulator.
  8. If fuel pressure is above specifications, inspect the fuel return line for kinks and blockage.

Capacity Test

  1. Remove the cap from the pressure test port in the fuel rail.
  2. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to the pressure fitting on the fuel rail (Fig. 7).
  3. Start the vehicle. Pressure should be approxi- mately 214 kPa (31 psi) with the vacuum hose connected to the pressure regulator and 269 kPa (39 psi) with the vacuum hose removed from the pressure regulator.
  4. If the pressure is not to specification, check the following before replacing the fuel pressure regulator:
  • 4a - Inspect the fuel supply and return lines/hoses for kinks or restricting bends
  • 4b - Check the fuel pump flow rate. A good fuel pump will deliver at least 1 liter of fuel per minute with the fuel return line pinched off. If the fuel pump does not pump adequately, then inspect the fuel system for a plugged fuel filter or fuel pump inlet filter (sock). Fuel pump flow rate can be done by connecting one end of an old A/C gauge hose to the fuel test port on the fuel rail and inserting the other end of the hose into a container of at least 1 liter capacity. Run the fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the fuel return line or most of the fuel will be returned to the fuel tank.

May 19, 2014 | 1996 Jeep Grand Cherokee

2 Answers

How to check fuel pressure 91 geo storm gsi


1.6L DOHC (same way as the ISUZU impulse ) same car.
4XE1 engine twin cam.
has MPI injection with fuel rail, regulator and loop
disconnecting the feed line and stuffing it with guage only does 1 of 5 tests. done on MPI. it does JUST the shut test.
the correct way it to check it at the filter or rail tests ports on most cars.
in some cases you must add it.
they sell banjo fittings with test ports at summit racing dot com.
so the first question on all MPI cars, is , where is the stock fittings.
other cars the rail has a schrader valve or a plugged hole to add one. (test port) did you look first for this?
to test the FPR, unplug the vacuum line running
and pressure will jump up 6 to 10 psi.
this simulates wide open throttle pressure, a key fact in getting full power from engine, i test cranking presssure, idle, 3000rpm
and wot pressures to be sure the PFR is working, not just the pump.



the spec at the rail is.

Late 1986 to 1993 I-TEC MPFI system (after VIN 0908197)
Regulator vacuum line connected-36 psi
Regulator vacuum line disconnected-42.5 to 45 psi

the shunt test can hit 60 pis easy. do so for only 5sec.
as this stresses the pump .

the only rail drawing , shows no fittings (cheap buggers)



not even a cheap plug...

24024302-wtht4tipiqsxmsfaksxjx4vs-4-0.jpg below is the twin cam, 1.6L
buy a TEE feeting, and put it at upper, red arrow.
use clamps rated for fuel injection, not chezzy screw band clamps as seen on carb cars. use the correct parts.
or you will get leak and it will not be pretty,
the filter as at 14 ID. this is the pressure feed side of the loop.
30 to 60psi , so all parts must be rated over 60, psi, (100psi is a nice goal)

24024302-wtht4tipiqsxmsfaksxjx4vs-4-1.jpg

now the words directly from the IMPULSE FSM.

Testing
  1. Relieve the fuel pressure.
  2. Disconnect the fuel line near the engine and install fuel pressure gauge T-connector in the line.
  3. Connect the fuel pressure gauge to the T-connector.
  4. Start the engine and check the fuel pressure, it should be:
  5. 4XC1-Turbo and DOHC I-Mark, G200Z Impulse: 35.6 psi with the vacuum hose of the pressure regulator disconnected and plugged. 28.4 psi with the vacuum hose connected and at idle.
  6. 4ZC1-Turbo, 4ZD1 Impulse and 4ZE1 engine: 42.6 psi with the vacuum hose at the pressure regulator disconnected and plugged. 35.6 psi with the vacuum hose connected at idle. Disconnect the VSV before checking pressure.
  7. V6 engine: 9.13 psi at the fuel pressure line after the fuel filter.
  8. 4XE1 SOHC and DOHC engine: Flow test, disconnect the hose from the EFI fuel feed line at the engine and place in a suitable container. Apply battery voltage to the fuel pump. Pump should supply 1/4 quart (0.24L) within 15 seconds. Pressure test, connect a pressure gauge in the fuel pressure line after the fuel filter, located at the driver's side frame rail. Disconnect the vacuum hose from the pressure regulator. Apply battery voltage to the pump. After the pump stabilizes, the pressure should be 35-38 psi (245-256 kPa) and hold steady.

Apr 06, 2014 | Geo Storm Cars & Trucks

1 Answer

Fuel shuts off at idle


One problem may be that you are having low oil pressure which will shut down the fuel pump. Connect a fuel pressure guage to the fuel rail to see if you are losing fuel pressure and also check if you haw enough oil pressure

Nov 01, 2013 | 1998 Chevrolet S-10 Pickup

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Fuel line location on montero sport ls


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1 Answer

1996 pontiac sunfire how to check fuel rail prassure


You attach a fuel pressure gauge to the fitting on the fuel rail, and turn the key on.

Mar 05, 2012 | 1996 Pontiac Sunfire

1 Answer

Have been given a 98 sunfire,it turns over but acts like it is starving for fuel or isn't firing. it doesn't backfire so i don't believe the timing is off. What else could it be?


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Thanks,
Lee

Mar 02, 2011 | 1998 Pontiac Sunfire

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