Diesel Fuel Injection System Help Desk

**Dieseldude** · December 18th, 2014 11:08 PM

Originally Posted by dr. d

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** · December 21st, 2014 04:40 PM

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** · December 26th, 2014 10:27 AM

Originally Posted by ParticleX

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.

**neil.corrigan12** · January 3rd, 2015 05:09 PM

we should know the basics of the IC engines.
1. Spark ignition
2. Compression ignition
In spark ignition engines during compression stroke the petrol air mixture is compresed at 1: 8 ratio the temperature at the end of the stroke is only 50-60 centigrade. Hence to burn the petrol mixture a spark plug is used to ignite the fuel mixture.
But in compression ignition engines during compression stroke air is compressed to 1:17 ratio that means 17 parts of the air is compressed to 1 part and at the end of the compression stroke the temperature of the air is more than 200 centigrade. At this stage diesel fuel injected on the hot charge hence a power stroke is generated.

**DHomeyyzz** · January 30th, 2015 07:34 PM

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..

**ka_omeng** · January 30th, 2015 10:15 PM

Wala ako masyado alam sir sa ganyan, pero di kaya barado fue filter????

**DHomeyyzz** · February 2nd, 2015 03:22 PM

Originally Posted by ka_omeng

Wala ako masyado alam sir sa ganyan, pero di kaya barado fue filter????

Nagpalit na po ng fuel filter 3 times na. pati peak pump na primer na nakalagay sa taas ng Fuel filter nagpalit na din.

**Dieseldude** · February 18th, 2015 09:48 AM

Originally Posted by 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

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.

**Dieseldude** · February 18th, 2015 09:52 AM

Originally Posted by 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..

Injection pump and possible glow plug failure ang problem mo.

**012512** · March 28th, 2015 10:43 AM

Originally Posted by Dieseldude

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.