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No fuel pressure in efi system - Cars & Trucks

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Either the fuel pump is not working, or the filter is totally blocked.
The fuel pump circuit needs checked to see if it's a wiring problem or a failed fuel pump. There will be (probably) a fuel pump fuse in your fuse block, and a fuel pump relay under the hood.
If you check the fuel pump wire for power at the gas tank connector while the engine is cranking over, and there is power there, and the ground for the pump is good, then the pump is not working and will have to be replaced. If you do not have power when cranking, the wiring at the fuel pump relay will have to be checked. Simple relay- has a power feed for the pump at one relay terminal (it is hot at all times), and a fuel pump wire to pump on another terminal (the power out for relay). When relay coil side is energized from a signal from computer, the relay contacts close and power is sent to the pump. The other relay terminal is a ground for the coil side of relay. Pull the relay out and you will see the diagram etched on it. If there is a fifth terminal, that could be a pump prime terminal, or a way to keep the pump running when engine is running through the oil pressure switch. But when cranking the engine, the computer will signal the relay to send power to the pump.

Posted on Dec 31, 2013

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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

92 geo metrofuel pump pressure


which engine?
i roll dice 1.0L G10. Suzuki
(25-33 psi)
depends on engine, and test done.
the key pressure and running pressure
the fuel pressure regulator does this.
and leak down test.
the TBI system and MPI work different. the FP reg is quite different
ill not guess what is there. until you say, what engine and EFI
it runs.

the chart below is a start.
its the running pressure i think.
when i do EFI, i do all 5+ tests in the book (FSM)
fuel pressure , run /non run
leak down test.
shut tests.
and the MPI balance test.
but that is how I do it, 100% not just 1 .




line up, of engines.
1.0 L LP2 I3 suz, G10 actual 25-31 PSI

1.3 L L72 I4

1.3 L LY8 16-valve I4
2fa6b915-f11c-4270-ae31-72afa9d7d5e8.jpg

Sep 08, 2014 | Geo Metro Cars & Trucks

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

Fuel cutoff switch


as always , check all fuses first... no DC power , NO JOY!
post a symptoms and list of tests.
no guessing, post engine size and country.?
lots of engines... which one,(open hood, look up, see sticker see engine name. like F22 or? 2.2L or what?

i cant guess i cant work from someones guess.. ever. (or fail)
sorry.
The EFI system only makes fuel pressure 30PSI
if cranking and spark is good.
the EFI cuts fuel for many reasons. you never stated it.
1: wont start.
2: low fuel pressure.
3: low only running.

the EFI also cuts fuel while cranking at WOT, right foot planted
that is, wide open throttle, super secret, unflood mode.
so if TPS is bad (ground were cut) no fuel, ever.
wow, in the FSM 12 fuel supply drawings, by sub model and engine.
in all case of the 12 drawings, the PCM controls the fuel pump directly
but not the GX, and CVT:GX
GOT A GX?



Nov 29, 2013 | 2004 Honda Civic

2 Answers

I have a 1989 ford f 250 302 efi im having a fuelissue i have found what i thought to be a fuelpump it comes on and everything with the key it is on the fuel rail toward the front of the truck but everyone...


Up until 1989, EFI fuel systems in the F250 actually used two fuel pumps; a low-pressure pump in the tank and a high-pressure pump mounted on the frame.seddy29732_7.jpgHigh Pressure Pump


The part on the fuel rail you are referring to is most likely the fuel pressure regulator, which, if bad can also cause fuel delivery problems. From 1990 and up, the two pump system was replaced with a single, in-tank pump.seddy29732_9.jpgHope this info helps you out!

Jun 03, 2011 | 1989 Ford F 250

1 Answer

Looking for shut off swicth for 1993 mercury topaz for fuel pump


Fuel Injected Engines

If the vehicle is equipped with a pressure relief valve, install an EFI/CFI fuel pressure gauge T80L9974B or equivalent and depressurize the fuel system. If the vehicle is not equipped with a pressure relief valve, the fuel filter connection should be covered with a shop rag or towel to prevent the fuel from spraying during the removal procedure. It is also possible to reduce the amount of pressure in the fuel system by locating the inertia switch (usually located in the luggage compartment) and disconnecting the electrical connection on the inertia switch. Next crank the engine for 15 seconds to reduce the system pressure

Nov 01, 2010 | 1993 Mercury Topaz

1 Answer

Were is fuel pump located


On the 2.3L and the 2.9L engines to model year 1988 the electric fuel pump system used on these EFI engines consisted of two fuel pumps: a low pressure boost pump mounted in the fuel tank, and a high pressure fuel pump mounted on the frame rail.

The low pressure electric fuel pump is located in the fuel tank and is a part of the fuel gauge sending unit.

Hope this helps.

Oct 28, 2010 | 1986 Ford Bronco II

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

Problem with Chevrolet 4.3 Vortec fuel pressure / oil pressure relay


a bad fuel pump relay will not cause vehicle to only run under 50. the oil pressure switch does bypass relay when pressure builds up. if you are having problems with running need to check fuel pressure. possibly caused by clogged fuel filter

Feb 14, 2009 | 2001 Chevrolet Blazer

1 Answer

1998 wrangler efi system


FUEL PUMP WILL PUT PRESSURE IN FUEL RAIL FOR YOU. sounds like fuel pressure in the fuel rail is losing pressure usally caused from fuel pump starting to go out. check pressure with fuel gauge. screw it onto the fuel rail connection turn the key forward (do not start ) then turn key off presure should hold around 16 psi. if the gauge starts to drift back down then the fuel pump is going to go out ( sometime)

Sep 03, 2008 | 1998 Jeep Wrangler

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