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What should the pressure guage indicate on the fuel test port at idle speed?

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The corrected fuel pressure is 32-36psi wile at idle .I hope this helped:)

Posted on Sep 24, 2009

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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.

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

4 Answers

Problem to start engine

Check all of the battery terminals and cables and check the wires on the starter/selonoid, start from the battery and follow the cable out and check all conections , clean and tighten them and if it still does it the starter/selonoid is bad and needs replacement...


Oct 14, 2008 | 1992 Chevrolet S-10 Blazer

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)


now the words directly from the IMPULSE FSM.

  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

2000 sl2 is hard to start and keep running esp when car has set for awile also has a misfre esp at idle seems less noticable when rpms are increased also seems to take a while to idle down when braking(has...

in order to diagnose problems like this much more info is needed, have you tested the electronic engine controls for trouble codes? (u will need to have the system scanned to find out these codes) if so what are those codes? the next test is to make sure the fuel pressure is not leaking down due to a defective fuel pressure check valve in the electric fuel pump located in the fuel tank, this will cause the engine to run poorly when first started, to test this u will need to buy a fuel pressure test guage tool for your car, the test port to measure pressure is on the top of the engine in the pipe that feeds fuel to the injectors, it looks like a big tire valve with a plastic cap on it, to test for fuel pressure leak down hook up the gauge and run the engine, you should have about 55-60 PSI at idle, make sure the gauge connection doesn't leak, then shut the engine off, the pressure should not drop by more than a few pounds of pressure, if it drops more than 5 PSI then u need to replace the fuel pump.

Sep 02, 2009 | Saturn SL2 Cars & Trucks

1 Answer

Engine misses 4.9l

here is the next step, you buy a fuel pressure test gauge from a parts store and hook it up at the test port at rear of the engine on top, it looks like a tire valve but metal, will have a plastic cap on it ( or should), test the fuel pressure should be around 50 PSI at idle. How is the fuel filter, ever been changed? it is due every 30,000 miles

May 08, 2009 | 1988 Ford F 150

2 Answers

Engine turns off at about 70mph, resumes at 65mph. Consistently.


Dec 11, 2008 | 1997 Toyota Tercel

1 Answer

Turns over, has spark but will not fire up

The fuel pump is in the gas tank, you test it by hooking up a pressure guage to the fuel injector supply manifold, there is a port there that looks like a tire valve, you will need a fuel pressure guage, Kragen auto and other stores will loan these out, you can also open the gas cap and listen for a humming type noise when the key is first turned on, but the fuel pressure test is best.

Sep 27, 2008 | 1989 Subaru Gl Wagon

2 Answers

Engine stall

The fuel injectors may need to be cleaned. Also the issue could be the fuel pump or fuel pressure regulator. You can test this by renting a fuel pressure guage from the auto store and hooking it up to the fuel rail on your engine. The port you hook it to is called a schrader valve and looks similar to a tire stem valve. If the pressure is low the problem could be either the fuel pressure regulator or the fuel pump. Good luck and if you found this solution helpful please rate it.

Thanks - Tech101

Jun 24, 2008 | 1998 Mercury Mystique

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