Diesel Fuel Injection System Help Desk

[Dieseldude]

Actually, it's not a stupid question.. If the filter is clogged and limiting fuel flow, replacing it will restore your fuel efficiency, higher or lower, whatever that was before the clogging. And it will also restore driving pleasure.. As in, pwede na namang umarangkada. My personal experience.. Nalimutan kong palitan ang filter ni diesel ko. Ayun.. Hina arangkada on the way home.Next morning, patay makina ten seconds after starting it.. But I did not notice fuel efficiency changes, maybe because everything happened so fast..

Dr D is right about the fuel filter. Failing to replace a blocked air filter will starve the engine of oxygen, an agent of combustion. This will result in low power, black smoke, and high fuel consumption.

[ParticleX]

Hi again DD,

Had my air and fuel filters replaced (yung air filter easy job lang, yung fuel filter ako rin sana gagawa kaso matigas at wala akong filter wrench so dinala ko sa mechanic). After replacing it at the shop, OK naman but nung nakauwi na ako and used the vehicle again eh it hesitates to startup (before I had the fuel filter replaced, one-click start palagi)

I was about to drop someone sa airport this early morning and naexperience ko ulit yung hesitation sa startup to the point of stalling (bumaba less than 500rpm) - suspect ko agad sa fuel filter job so tinabi ko muna then I primed the pump (diba dapat the pump should be rock-hard? pag prime ko malambot) then checked the hoses. Nagamit ko naman and pagkauwi ko I checked all the clamps and yung return line sa assembly ay maluwag na and yung screw thread is stripped so I did replaced that clamp and primed it again until hard and OK na ulit.

This afternoon chineck ko yung fuel primer kung matigas and surprisingly its not, so ini-start ko and may hesitation ulit (as far as I know may hangin ulit sa system right?), so plan ko na lang to replace all hoses and clamps. I assume hindi naman ito kamahalan? Also may nabasa ako na the injectors should be bled? Could you expound on this so I can tell my mechanic.

Many thanks

[Dieseldude]

This afternoon chineck ko yung fuel primer kung matigas and surprisingly its not, so ini-start ko and may hesitation ulit (as far as I know may hangin ulit sa system right?), so plan ko na lang to replace all hoses and clamps. I assume hindi naman ito kamahalan? Also may nabasa ako na the injectors should be bled? Could you expound on this so I can tell my mechanic.

Many thanks

You are right about checking hoses and clamps. Also, check orings on 3 locations: filter to top housing, water sensor at bottom part of filter, sealing gasket on air bleed screw located on to of filter housing.

[DHomeyyzz]

Hi sir DieselDude,

We have a 2003 Pajero fieldmaster..Ang symptoms po ng ride namin is hard starting sya sa umaga and sabay it blows white smoke and rough idling. If i-pump yung fuel primer sa fuel filter gaganda andar nya maghapon. Kinabukasan ng umaga hard starting nanaman sya and we have to pump the fuel filter primer again, after than maganda na naman andar nya ulit. We last calibrated our injection pump Sept 2012. We also replaced Glow Plugs this month lang.

May nabasa din po pala ako sa internet esp. in Australia na pag hard starting with rough idling and white smoke ang 4m40 at pag pinump ang fuel filter primer at gaganda na ang andar nito ay baka raw Oil seal na ng injection pump ang may sira. Na sabi daw doon ay air is sipping into the pump at umaatras ung fuel pabalik ng Filter/tank. Duda nga ako sa huling nagcalibrate, kasi baka hindi maayos ang pagka-calibrate o hindi maganda ang pinalit na Oil seal/O-ring.

Nung binalik namin sa dating nagcalibrate at sinabi namin ang problema at symptoms ng sasakyan ay alam na raw nila kung ano ang gagawin. Ang sabi daw nila ay i-aadjust lang daw ang injection pump timing para daw hindi mahirapan kumuha ng diesel fuel. Nung na adjust na nila ang injection pump timing ay gumaspang naman ang andar, at kinabukasan nung pinaandar namin ng umaga ay ganun parin ang sakit nya .

Anyways yun lang po.. any advice from you sir can be very helpful po sa amin..

[Dieseldude]

Hi sir DieselDude,

We have a 2003 Pajero fieldmaster..Ang symptoms po ng ride namin is hard starting sya sa umaga and sabay it blows white smoke and rough idling. If i-pump yung fuel primer sa fuel filter gaganda andar nya maghapon. Kinabukasan ng umaga hard starting nanaman sya and we have to pump the fuel filter primer again, after than maganda na naman andar nya ulit. We last calibrated our injection pump Sept 2012. We also replaced Glow Plugs this month lang.

May nabasa din po pala ako sa internet esp. in Australia na pag hard starting with rough idling and white smoke ang 4m40 at pag pinump ang fuel filter primer at gaganda na ang andar nito ay baka raw Oil seal na ng injection pump ang may sira. Na sabi daw doon ay air is sipping into the pump at umaatras ung fuel pabalik ng Filter/tank. Duda nga ako sa huling nagcalibrate, kasi baka hindi maayos ang pagka-calibrate o hindi maganda ang pinalit na Oil seal/O-ring.

Nung binalik namin sa dating nagcalibrate at sinabi namin ang problema at symptoms ng sasakyan ay alam na raw nila kung ano ang gagawin. Ang sabi daw nila ay i-aadjust lang daw ang injection pump timing para daw hindi mahirapan kumuha ng diesel fuel. Nung na adjust na nila ang injection pump timing ay gumaspang naman ang andar, at kinabukasan nung pinaandar namin ng umaga ay ganun parin ang sakit nya .

Anyways yun lang po.. any advice from you sir can be very helpful po sa amin..

Injection pump and possible glow plug failure ang problem mo.

[Dieseldude]

Hi sir DieselDude,

We have a 2003 Pajero fieldmaster..Ang symptoms po ng ride namin is hard starting sya sa umaga and sabay it blows white smoke and rough idling. If i-pump yung fuel primer sa fuel filter gaganda andar nya maghapon. Kinabukasan ng umaga hard starting nanaman sya and we have to pump the fuel filter primer again, after than maganda na naman andar nya ulit. We last calibrated our injection pump Sept 2012. We also replaced Glow Plugs this month lang.

May nabasa din po pala ako sa internet esp. in Australia na pag hard starting with rough idling and white smoke ang 4m40 at pag pinump ang fuel filter primer at gaganda na ang andar nito ay baka raw Oil seal na ng injection pump ang may sira. Na sabi daw doon ay air is sipping into the pump at umaatras ung fuel pabalik ng Filter/tank. Duda nga ako sa huling nagcalibrate, kasi baka hindi maayos ang pagka-calibrate o hindi maganda ang pinalit na Oil seal/O-ring.

Nung binalik namin sa dating nagcalibrate at sinabi namin ang problema at symptoms ng sasakyan ay alam na raw nila kung ano ang gagawin. Ang sabi daw nila ay i-aadjust lang daw ang injection pump timing para daw hindi mahirapan kumuha ng diesel fuel. Nung na adjust na nila ang injection pump timing ay gumaspang naman ang andar, at kinabukasan nung pinaandar namin ng umaga ay ganun parin ang sakit nya .

Anyways yun lang po.. any advice from you sir can be very helpful po sa amin..

This is an injection pump problem.

[testament11]

Hi guys, may problema kasi ako sa Pajero 4M40 ko.

First thing in the morning pag pina-start, ok naman, one click starting. Kaso ang problema, after ilang minutes, namamatay na parang kinakapos sa krudo. There are times pa nga na tinatakbo ko na siya ng around 1 km from home eh bigla bigla nalang kinakapos ng krudo. Once this happen, kelangan bombahin pa yun accelerator para lang mag-start yun makina. After nito, di naman na ako namamatayan. Ano kaya possible problem nito? Feel ko parang pinapasok ng hangin yun fuel line ko.

Fuel filter was replaced November last year lang. Donaldson pa nga fuel filter nito.

Thanks sa makakatulong!

[jakewise]

I suspect a dirty fuel line.. Check your fuel filter again kahit na you just changed it, baka madumi na. If madumi na, I suggest you have your fuel tank cleaned, baka madami na din dumi

[ParticleX]

Check yung fuel lines, nangyari na sa akin yun nung nagpalit rin ako ng fuel filter. May nakakapasok na hangin so ginawa ko pinalitan ko na lang yung dalawang short sections ng hose galing fuel filter then replace clamps

[Dieseldude]

Hi guys, may problema kasi ako sa Pajero 4M40 ko.

First thing in the morning pag pina-start, ok naman, one click starting. Kaso ang problema, after ilang minutes, namamatay na parang kinakapos sa krudo. There are times pa nga na tinatakbo ko na siya ng around 1 km from home eh bigla bigla nalang kinakapos ng krudo. Once this happen, kelangan bombahin pa yun accelerator para lang mag-start yun makina. After nito, di naman na ako namamatayan. Ano kaya possible problem nito? Feel ko parang pinapasok ng hangin yun fuel line ko.

Fuel filter was replaced November last year lang. Donaldson pa nga fuel filter nito.

Thanks sa makakatulong!

Injection pump problem.......most probably.

[Ry_Tower]

Hi guys, may problema kasi ako sa Pajero 4M40 ko.

First thing in the morning pag pina-start, ok naman, one click starting. Kaso ang problema, after ilang minutes, namamatay na parang kinakapos sa krudo. There are times pa nga na tinatakbo ko na siya ng around 1 km from home eh bigla bigla nalang kinakapos ng krudo. Once this happen, kelangan bombahin pa yun accelerator para lang mag-start yun makina. After nito, di naman na ako namamatayan. Ano kaya possible problem nito? Feel ko parang pinapasok ng hangin yun fuel line ko.

Fuel filter was replaced November last year lang. Donaldson pa nga fuel filter nito.

Thanks sa makakatulong!

Namamatayan ka kahit warm-up pa lang. Sa akin kasi kapag less than 3.minutes warm-up ko namamatayan ako kahit nabiyahe ko na din ang sasakyan.

Nagsearch ako sa net and one of the problem na malapit na malapit sa symptoms ko ay yung leak daw sa topmost gasket sa injection pump. Puwede papalitan yan pero matrabaho. Square yung gasket at hindi o-ring type. Pero may solution na simple. Put engine oil stop leak sa fuel tank. Same ratio as with 2t oil. 5ml for every liter. Seems to be working for me after 3 days of use. Pero usually mga 1week daw marerejuvinate ang seals na makunat na kay nakakapasok hangin. Read ka dun sa pajero thread natin. Hehe. Baka makatulong.

[Dieseldude]

Remove black fuel hose between fuel filter and injection pump.

Replace it with a clear transparent hose.

Start engine to check for air bubbles on this clear hose.

[Ry_Tower]

Hi guys, may problema kasi ako sa Pajero 4M40 ko.

First thing in the morning pag pina-start, ok naman, one click starting. Kaso ang problema, after ilang minutes, namamatay na parang kinakapos sa krudo. There are times pa nga na tinatakbo ko na siya ng around 1 km from home eh bigla bigla nalang kinakapos ng krudo. Once this happen, kelangan bombahin pa yun accelerator para lang mag-start yun makina. After nito, di naman na ako namamatayan. Ano kaya possible problem nito? Feel ko parang pinapasok ng hangin yun fuel line ko.

Fuel filter was replaced November last year lang. Donaldson pa nga fuel filter nito.

Thanks sa makakatulong!

Musta na problem mo bro? Puwede din pala problem is shut-off valve. Baka sira na kasi.

[testament11]

Musta na problem mo bro? Puwede din pala problem is shut-off valve. Baka sira na kasi.

Ni-set aside muna namin yun problem for a month kasi inayos muna namin yun power steering lines. Now that ok na yun steering ng sasakyan, ito na ang next namin na tututukan.

As of last Tuesday, same problem pa rin. Nagdecide kami na dalhin ko yun sasakyan sa CDC once magkaroon ako ng free time. May hinala na rin kasi kami ng erpats ko na injection pump problem na ito.

[glenn manikis]

Fuel filter ️Sir ... Baka madumi na fuel tank mo.. Kaya recurring ang problem mo..

[kidgz]

pag may hangin ang fuel lines,kailangan e bleed para solid ang cruedo pumapasok

[Dieseldude]

Hi again DD,

Had my air and fuel filters replaced (yung air filter easy job lang, yung fuel filter ako rin sana gagawa kaso matigas at wala akong filter wrench so dinala ko sa mechanic). After replacing it at the shop, OK naman but nung nakauwi na ako and used the vehicle again eh it hesitates to startup (before I had the fuel filter replaced, one-click start palagi)

I was about to drop someone sa airport this early morning and naexperience ko ulit yung hesitation sa startup to the point of stalling (bumaba less than 500rpm) - suspect ko agad sa fuel filter job so tinabi ko muna then I primed the pump (diba dapat the pump should be rock-hard? pag prime ko malambot) then checked the hoses. Nagamit ko naman and pagkauwi ko I checked all the clamps and yung return line sa assembly ay maluwag na and yung screw thread is stripped so I did replaced that clamp and primed it again until hard and OK na ulit.

This afternoon chineck ko yung fuel primer kung matigas and surprisingly its not, so ini-start ko and may hesitation ulit (as far as I know may hangin ulit sa system right?), so plan ko na lang to replace all hoses and clamps. I assume hindi naman ito kamahalan? Also may nabasa ako na the injectors should be bled? Could you expound on this so I can tell my mechanic.

Many thanks

I'm sorry for this very late reply. It is very possible that you could be pulling in air through faulty fuel hoses and clamps.

Regarding bleeding of injectors, you can do this if you suspect air in your system. You don't need to bleed air once you get your engine running.

[012512]

Dr D is right about the fuel filter. Failing to replace a blocked air filter will starve the engine of oxygen, an agent of combustion. This will result in low power, black smoke, and high fuel consumption.

Hi thanks... kaya pala malakas ang kain ng fuel dahil sa palitin na air filter.. kaya bang I-DIY yan sir? KIA CARENS ang sasakyan.

[Dieseldude]

Hi thanks... kaya pala malakas ang kain ng fuel dahil sa palitin na air filter.. kaya bang I-DIY yan sir? KIA CARENS ang sasakyan.

Of course. Bumili ka ng air filter element, tapos ikabit mo........Solved. Good luck.

[012512]

Of course. Bumili ka ng air filter element, tapos ikabit mo........Solved. Good luck.

How much nga pala ang air filter sir?