Fuel pump psi

IS Australia, (USA answers me)
and now we know 3.6 L Alloytec (LY7) V6 engine, by GM. (chain drive.DOHC cams)
2004 first one.
you say spark is good but to all 6 cylinders or just 1.?

that is normal, for PUMP,
key on may run pump for 1 to 3 seconds, called PRIME,cranked pump runs full time cranked by designand engine running pump runs full time so all that is normalsome pumps are silent running and BOSCH makes those and brags about it. yeah nice so a tech uses 2 tools ! always
a voltmeter at pump 11v min, (wires drop 1v) as does starter load.
and a fuel pressure gauge. or it's all just a guessing game.
now rule #1 ALL PCM cut fuel 1 or 2 ways if spark or its precursors are detected as FAIL (by law and to end crash and burn seen on TV)
3 ways top fail cmp,ckp or coil packs dead , make spark dead. and more lots more. even spark wires old.for sure those carbon core junk.
so spark is first NEVER FUEL FIRST.
I test all spark HV wires with new test park plug, grounded

also SOME failures fool the PCM in to thinking spark is good and is not.but we all know the PCM is not AI or genius grade yet.
no year car told but is 2004 up. to 2007.
engine size, 3.6L petrol (gasoline) and VVT,
how many miles on the engine, 300k miles or 500Kmeters?
The VVT can file. as can chain guilds.
VVT can fail and case 50degrees of error at cams, cranking , not good that.

Now spark failures, on high mileage engines, there ar 6 COP spark coils to fail
and spark plugs too, over 100kmiles.
the cops have 6 boots that love to age crack and spark cause carbon tracking that shorts out dead the spark plug ,new boots are $15 each 10x cheaper than new coils with boots. (a cost savings Idea)
spark is good only when all 6 are good.
that is all I can say on 2004 car, many have super high mileage.

WOW YOU DID IT ALL THERE, SUPER GOOD JOB
10-PSI IS DEAD WONG.

1. bad pump ir rusted wires to it, or pins,
2. bad FPump relay. burned contacts in it. bad.
3. bad FPR FP regulator. and vacuum nipppple not leaking fuel./
4. clogged inline fuel filters. even pump sock bad.

for sure new filter is easy, inline easy to put hands on first.
does F250 have front and rear fuel tanks? and fuel tank selector valve?
The Fuel Tank Selector Valve allows the driver to switch between the vehicle's front and rear fuel tanks. hummmmmm?
this is mpi (efi) engine right. v8,
they made 3 systems sadly the year, 1 pump or 2pumps.
"The fuel delivery system uses either a high or low-pressure in-line or in-tank electric fuel pump, with some models equipped with both
fuel pumps."

in a real shop we can see on scope that the Brush segments on the commutator or the pump are dead. and now pump is weak. even about to fail amazing no? there is Youtube that vie Duane page.
what is spec, ok I will look in your service manual for that.

the FPR (if pump good and passes the shunt test)
the FPR vacuum conn. must have good no vacuum key off and full vacuum max 20inchs Hg. at idle and when throttle gunned vaccuum falls fast, and fuel pressure goes 6psi changed from
idle to driving up a hill full load wot, wide one throttle.
at full idle vacuum fuel pressure is lowet, and at WOT, fuel pressure is the most. near 40 PSI or HP will not happen (full power full fuel flow)

10PSI usually means pump is bad. FPR can not hold 40+ when weak pump.

the other test is keyon pressure is max then but pump only runs 1second, so the trick is, crank for 5sconds max (save da battery)
46psi/
OMG this beast has 2 fuel pumps . ONE IN LINE.
"include a high pressure inline electric fuel pump, a low-pressure tank-mounted fuel pump, fuel charging manifold, pressure regulator, fuel filter"
ok let me look that up.
quote
"The pressure regulator reduces fuel pressure to 39-40 psi (269-276 kPa) under normal operating conditions. At idle or high manifold vacuum condition, fuel pressure is reduced to approximately 30 psi (207 kPa).(idle is lower PSI due to huge vacuum in he plenum)?

Schrader type valve at rail

I trying hard to learn the exact parts for fuel this v8 uses
the only tricky parts here is dual tanks
and the number of pumps on the truck
some low pressure tank pump and frame mounted high pressure 40psi up , pump and shunted can do over 60psi. a shunt test is output hose (blocked) old pump fail this easy with bad brushes deep inside. (commutator segments some wrecked)
that is all , hope it helps you, need more fact to deep, for sure 2 thanks.

No data exists on rotation speed.

https://www.google.com/search?q=Toyota+Hilux+2.5+D4D+fuel+pump+rotation+speed

Fuel Pump Pressure and Volume.

Fuel Pressure and Volume Testing - Toyota Service Blog

https://www.toyotaguru.us > engine-control-systems > f...
5 days ago - 33 PSI. 40 PSI. 38 PSI. 46 PSI. Engine Off Residual Pressure (after 5 minutes). > 21 PSI. > 21 PSI. Maximum Pump Pressure* (pressure relief ...

Pumps and Injectors. Search Query is

Toyota Hilux 2.5 D4D diesel fuel pump pressure

https://www.google.com/search?q=Toyota+Hilux+2.5+D4D+diesel+fuel+pump+pressure

..

SOUND LIKE FUEL PUMP.REPLACE FUEL FILTER,CHECK FUEL PRESSURE SHOULD BE 9 -13 PSI. FOR TBI FUEL INJECTION AND 55 - 61 PSI FOR MFI MULTIPORT FUEL INJECTION SYSTEM.

Problem is usually caused by the regulator in the spider head. It may not be installed correctly, not getting enough vacuum from the intake upper manifold or is failing. Start by checking the vacuum at the manifold.

40.5 psi to 47.0 psi
wiyh engine off , ignition on and fuel pump running
fuel system pressure with engine running at idle will be low at 40.5 give or take 2 to 3 psi meaning 40.5 plus 3 psi more or 40.5 to 3 psi less

On that one it actually called circuit opening relay under left side of dash in fuse relay box

check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump

#1

38.0 - 44.0
Note

Y251
#2

30.0 - 37.0
Note

Y252
Y251: Pressure (PSI) is measured at cold start injector with pressure regulator vacuum disconnected.
Y252: Pressure (PSI) is measured at cold start injector with pressure regulator vacuum connected.

i believe it's around 80, but anything higher than 60 should run it somewhat, just lacking power, and dogging out while accelerating, like a running out of gas symptom.