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How much fuel pressure dose a 4.8 efi need - Cars & Trucks

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  • Cars & Trucks Master
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I assume you have a chevy, so on that guess, 55-62 psi.

Posted on Dec 29, 2016

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Posted on Jan 02, 2017

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I got a Susuki vitara 1994 model which has no acceleration.


Does the check engine or service soon light come on ? It is possible that the cataletyic converter is pluged or the stuff inside the cat some times will break apart and block the outlet in the exaust pipe causing lack of power.

Jan 06, 2015 | 1999 Suzuki Vitara

1 Answer

2001 suzuki esteem wagon


1.6L or 1.8L vastly different engines... and EFI.
fuel to the rail , only means the pump is active , never good.
28PSI is minimum on all cars. 1psi will never start a car. ever
and the rail will shoot fuel, all day. it fruitless , unless the rail is dead.
see?
First the laws of EFI. (works all gas EFI)
  1. all fuses good.
  2. 12vdc to EFI system , below 10v is bad. (see lamps dim? bingo)
  3. The PCM (EFI brain) will never inject if it sees CMP/CKP or spark primary dead. ever. so, spark is first.
that is double reasons, fuel cant burn if no spark and if ECU
thinks spark is bad it cuts fuel, (fire safety and fuel hydralocking reasons)

so you connect any scan tool to the DLC, OBD2 port , by knees.
and crank for 5 seconds, release key, no turn off
see DTCs (errors) for CMP, or CKP sensors (cam/crank?)
bingo
no, then you crank and look at the RPM PID , live data stream the scan tool, see RPM go to 250rpm cranking, good.
ok , PCM thinks all is good....

i then check the #1 injector with a NOID lamp
i crank it flashes, good.
if not , i do all injectors , if one fails the pcm is dead on this line.
if yes, all dont flash the PCM is seeing some gross errors. ask. why./?
if all flash, then the fuel rail is dead. and your rail test was useless.

until you discloses engine option (size) I cant give spec numbers.
i then connect my fuel pressure gauge $20 tool to the fuel rail test
port, and i get 10psi, FAIL
i check voltage to the fuel pump cranking, i get 8v, bingo bad wiring
or bad fuel pump relay.
say 10psi and 12v at pump cranking,
the pump is bad, or the filter clogged , or the fuel pressure regulator
is stuck wide open killing all legit pressure.

that is how i do it.
keep in mind the PCM cant see fuel pressure on most cars.
some newer cars have this sensors. (nice)
low fuel pressure,. renders the whole EFI , useless. just junk.

Mar 12, 2014 | Suzuki Esteem Cars & Trucks

1 Answer

The car turns on, after 3 or 4 seconds the car shuts off.


expensive guessing there ,wow !

why not find out why ,by using diagnosis, its far cheaper, i promise.
engine stalls:
A: can you save the stall>? with a fast right foot action????
yes, then its not 12vdc power lost to EFI system.
no, then it must be lost spark or lost fueling or flooding.
did you do the full 60k mile tune up yet? and the 90k? ever interval?
your mech. can't find this? is that what you are asking.???

stalls list, near impossible to answer not knowing, test A: above !
but here goes.
1: lost 12vdc power, EFI dies. engine dies. volt meter saves day.
2: lost spark, (cant save stall, test A, for this or lost 12vdc)
3: lost fuel pressure , stall can be proven with using test fuel at stall point. (spray fuel into intake) below 30PSI fuel, on all cars is bad.
4; flooding, from too much fuel pressure, say over 60psi, causes flooding, leaking injectors, so an injector leak down and balance test shown in the FSM.
See soaking wet spark plug tips (free easy check)??? flooding.
fast foot easy prevent stall, ? yes, ISC stuck closed. clean it
harder fast foot save is EGR stuck open. clean it.
impossible fast foot save is , #1,2,3 above.

all above can be tested easy and with cheap tools.
the engine runs by order. "classic list"
do the tune up.
1: 12vdc to EFI ,key on, all the time.
2: engine compression at spec, or 150psi. 90k timing belt ignored?
3: good spark and timed right. (strobe light test)
4: good fueling (not lost , or flooding)
5: EGR not stuck open, ISC not stuck closed.

this gets most stalls.
if fuel pressure is at bad shunt levels, +60psi , due to the fuelpressue
regulators stuck closed. (in side tank it is so is fuel filter.)
the engine will flood , i check fuel pressure. way before any ECU swaps. infact i check all ECU inputs first. and fuel pressure must be in spec range too.
good luck.

Mar 02, 2014 | 2004 Honda Civic 1.7

1 Answer

Install fuel pressure regulator


converted from efi to carb, fuel pump pumps too much 10-14

need about 4-6 for edelbrock carb

Jan 11, 2014 | Ford Windstar Cars & Trucks

1 Answer

Diesel engine


no DTC posted, wow , nor year. and which Diesel.
I guess you need to understand how EFI works
in a nut shell, the EFI can compensate for weak parts.
including a weak pump.
that magic is called closed loop.
but on newer cars, the pump is monitored for proper pressure,
this is a godsend.
if the pressure drops, IT WILL GET Worse.
Great information to learn just before a 3000 mile trip, right?"
it's and early warning,,,
and can be caused by many things.
1: love voltage to pump, (bad wiring)\
2: pump weak.
3:: fuel pressure regulator stuck open (or closed of pressure too high
you never gave DTC so cant advise ,)
4: crushed fuel lines, from driving off road. etc.
some cars uses different Diesel injection systems in different countries.
and country not stated.

May 25, 2013 | Suzuki Grand Vitara Cars & Trucks

1 Answer

1989 Toyota 4 runner 4 EFI hard to start when cold


Have you checked fuel pressure before and after the first attempt to start ?
It could be low fuel pressure or a problem with the cold start injector if equipped.

Feb 21, 2013 | 1989 Toyota 4Runner

1 Answer

Hard to start camry


you need o install a fuel pressure gauge on it and see if the fuel pressure drops down after sitting and how fast it jumps up if it does

Aug 07, 2012 | 1989 Toyota Camry

1 Answer

REPLACEING FUEL FILTER


Pressure Relief
Special Tool(s) EFI/CFI Fuel Pressure Gauge
310-012 (T80L-9974-B) swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before servicing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.
  1. Remove the schrader valve cap and attach the EFI/CFI Fuel Pressure Gauge.
  2. e5e3ebf.gif
    NOTE: Open the manual valve slowly to relieve the system pressure. This may drain fuel from the system. Place fuel in a suitable container.
    Open the manual valve on the EFI/CFI Fuel Pressure Gauge slowly and relieve the fuel pressure. 9deacdd.gif
    Filter Removal
    1. Relieve the fuel pressure; refer to Above.
    1. Remove the fuel filter (9155).
      1. Disconnect the fuel lines
      1. Remove the fuel filter from the fuel filter support.
      2. b717c63.gif
      1. Push Connect Fittings
        Special Tool(s) Fuel Line Disconnect Tool
        310-S039 (T90T-9550-S) 4bbcf9e.gif
        1. Relieve the fuel pressure; refer to Pressure Relief in this section.
        1. Disconnect the safety clip from the male hose.
        2. Install the fuel line disconnect tool and push into the fitting. f0af03c.gif
          Install the fuel line disconnect tool and push into the fitting. 367328f.gifSeparate the fittings.
          • Inspect for damage.
          • Clean the fittings.
          • 3beef33.gif

Sep 02, 2010 | 1998 Ford Explorer

1 Answer

93 4 Runner fuel problems


Don't worry, there is only about 100 things that can keep the EFI system from working properly. Try this 1st: My '91 4runner wont run properly, or at all, when the Air cleaner / intake assembly is not hooked up / installed, it needs the MAS air flow sensor to measure the incomming air or it will not run. Then, Are you getting positive pressure of fuel to to the engine from the tank yet or is the pump just running? Thread a pressure gauge to the fuel rail on the engine & check pressure with key on / engine off (should be between 35-45 psi) Check / replace the fuel filter & try disconnecting the fuel & return lines lines @ both the tank & Throttle body & blowing out with 25-50 psi air to ensure the line is clear. You may need to vacuume test the fuel pressure regulator on the fuel rail. If you are still having problems, it can be the injector(s), the fuel pump relay or any of the sensors in the EFI system including the VSV sensor, which measures the fuel pressure & relays the info to the ECM (computer). To check & test all of the sensors it will be worth the $20-30 Haynes or Chilton Manual. start with the easy stuff though, then work up to the sensors & electronics

Feb 18, 2009 | 1998 Toyota 4Runner

1 Answer

My 1987 f250 efi straight 6 4 spd starts and then dies 90,000mi


Some years of the "F" series pickups had two fuel pumps,, one High Pressure and One Low Pressure.
It could be either one.

Jan 19, 2009 | 1986 Ford F 250

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