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Hi, i've changed the diesel pump on my 2005 Isuzu Kb 300 4jh1 now it won't start and shows ecu error p1651. What can it be?

Posted by Andre on

  • Andre Sep 04, 2016

    It sounds like it wants to start, but if you touch the fuel pedal it then just crank



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  • Isuzu Master
  • 20,706 Answers

A usa forum
we dont have a single KB here,\not one,
good luck!
so where is it, Africa, Australian
we cant guess that either,
and only one poster ever here on KB ever told that.
all others, silent.
sad. and epic failure.

Posted on Sep 09, 2016


5 Related Answers

A Mayers

  • 110 Answers

SOURCE: Isuzu 1997 KB 260 Workshop Manual

try or your local parts store for a Haynes manual.  For around $20 they are frequently as good or better for home mechanic than factory manuals for $100.

Posted on Nov 06, 2008



  • 1 Answer

SOURCE: isuzu 2001 diesel engine won't start

cant start deisel 3.0 lilter sounds like there is no fuel getting to the engine

Posted on Feb 15, 2009



  • 235 Answers

SOURCE: Isuzu bighorn diesel 4jg2 engine timing diagram

This site has it .

Posted on Aug 25, 2009

SOURCE: I have a problem starting

Seems you may have a similar problem on your machine to the one we've had....The 4JX1 has taught us a lot we didn't know before, but specificly for this particular engine. First I'll advise you check the obvious things...Make sure that your battery is charged fully. I'll explain why later. Next make sure that there's no air in the fuel system....On the filter housing you'll see a ten millimeter bolt, which should be loosened and once loose push the plunger atop the housing to remove any air....If bubbles come out you'll know that that was the problem or part of it. With this particular engine the ORPS (sensor) gives the type of problems you're talking about. The sensor in question is fitted inside the tappit cover into the oil rail (which is the cylindrical pipe fitted over the valve assembly....It has two sensors, one being the ORPS and the other being an oil temprature sensor. To get to these it'll mean removing the tappit cover which means first removing the inter cooler....then the oil feed pipe which fits into the side of the cover, Remove all the screws (five each side and three at each end)....The ORPS is the smaller of the sensors....It is a sensor which operates with a cystal....The oil preesure pressing against it will cause a very small voltage which is actually a pulsed signal....That signal is sent to the management computer and controls the solid state switch which allows the circuit for the injectors to beecome active....Remeber the battery? If the battery is not able to turn the engine at what you'll hear as a normal speed the oil pressure will not be enough to send the signal which opens the injectors....The ORPS (Oil Rail Pressure Sensor) cost's about two hundred and twenty US$ and if you do the job yourself your probably save a similar amount on labour charges....The engine oil is also critical....Only use the recommended oil....If that has not been used....Buy double the amount of the correct oil and two of each filter....Drain what's there and then refill with the recommended oil (once vehicle is up and running) run the engine for thirty minutes or so (pref on the road) and then re drain and again fit the other set of filters and refil....We don't like the chemical engine flush addatives, too dangerous, esspecially in a diesel engine.... Hope this is help Ron Let me know how you get on. you can send your reply to this same web site...I'm one of the experts.... Cheers for now.... Best regards Johngee10

Posted on Feb 02, 2011

Testimonial: "Thanks for your solution Ron. It was exactly the problem you suggested it could be - with the correct solution"

Stan Ford

  • 2910 Answers

SOURCE: My 5.9 dodge cummins diesel won't start, I've replaced the fuel lift pump, and the fuel filter, turns over. But will not start?

I think air in the system may be the problem ,Does the filter housing have a bleed nipple, open it and work the lift pump till fuel flows with out air bubbles, it no bleed nipple crack the fuel filter output line and bleed from there.

Posted on Feb 07, 2015

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2002,2.5 turbo diesel Isuzu pick up KB. after some body work,the garage couldn't get it started. Diagnostics show problem with crank sensor, second shows diesel pump problem, which one is correct?

Body work does disturb wiring and connections. Both could be correct and the results show that it is loose connections. Check all connections especially close to the body work area. Disconnect and reconnect all connectors in the vicinity of the body job.

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Have a isuzu kb 250 2007 diesel, cut fuel while driving,tried to change all filters is still does the same there an electric fuel pump inside the tank?

called a lift pump
by the parts picture
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and or the fuel rail pressure sensor



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How to check if my timming is correct on a isuzu 300tdi lx 2005 model

welcome to a USA forum
the country with ZERO
isuzu 300tdi ITS A KB truck , you lift off KB AGAIN.

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98 Isuzu Rodeo Fuel pump not working Fuses and relays goodNew fuel pump

no engfne even stated.
why not say what "not working" means.?
Engine cranks ok but will not start, RIGHT?

Ill pretend fuel pressure is 0 PSI cranking right.

IMMObilzer light glowing? bingo.
interial switch tripped (was in a crash>?)see photo below...
The PCM sees dead spark so cuts all fueL? sure.
(it will, if it does?, scan it yet? cranking, that be first.)
The PCM can cut fuel for many reasons.
2 dead sensors, and spark dead on the tacho line.
1,2,3 bam
and immo set. 4
and the inertial switch, if fitting many are not.
what matters most (1st) is 12vdc to the pump actual cranking, does it have 11vdc at least>?
if you see 12vdc and PSI is 0 or not spec cranking
at the rail, then the filter can be clogged.
not just a dead pump,, i cant hear pumps cranking so.... i use TOOLS> to see whats going on.

to a DIY, vast answers.
1: makes noise.
2: fuel rail drips or not.
3: 12vdc missing to pump or not, cranking?
4: 0 (zero) PSI pressure at rail cranking

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My isuzu kb 250 is having a hard start in the morning and will idle rough and picks up later. but when you try to accelerate it looses power and cuts off or cuts off at intersections when I slow down. It...

wow NO YEAR CAR STATED are you kidding?
what country you just posted a non usa car on a usa forum.
so what engine>? cant fix engine (any) not knowing that.
seems like Diesel, (Glow plugs)
seem you are guessing?

if diesel is it direct injection? we cant guess that either.
but if it is ,ever use a scan tool;?

what car, kb250 something, is it a pickup truck
what engine,
what country.
what miles.
is fuel good? did car sit long, a year?
do not disconnect sensors. ever.
nor bypass pumps, ever. (cept a few minute test) but bypassing pumps invites blowing the H3LL the injector ECU. big bucks that.
the pumps are run this way to prevent CRASH on burn , like seen on TV, ever see one for real.? not pretty, (cant unsee that.... ever)

Mar 31, 2015 | Isuzu Cars & Trucks

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Hi, Our ISUZU 280 KB doesn't get diesel through..if you start the bakkie it initially starts but the engine quickly dies even if you floor the accellerator. If you press the "manual diesel pump"

Blockclogs easily if you get some water in the diesel.age in fuel system. Remove both pipes from tank to pump and blow. If clogged replace. Also check fuel filter. That thing

Dec 03, 2012 | Cars & Trucks

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