fuel pump problem kaya?

[harimon21]

Driving a lancer 91 EFI. Lately may intermittent problem sya na di ko maintindihan. Naeexperience ko with more frequency lately na ung engine parang sinisinok and nagjejerk (di naman nagtatagal) kapag tatapak sa gas lalo kapag akyatin at mag-oovertake, then noticeable yung loss of power lalo na pag accelerating. Some days normal sya, some days hindi. Lumalabas yung sakit lalo na pag-long drive, seems ok on short level trips though. I suspect fuel pump, kase parang kinakapos at bagal umakyat ng rpm. Ok naman air filter, sparkplugs and no CEL is present. Some say might be dirty fuel tank. Ano kaya?

[jick.cejoco]

Driving a lancer 91 EFI. Lately may intermittent problem sya na di ko maintindihan. Naeexperience ko with more frequency lately na ung engine parang sinisinok and nagjejerk (di naman nagtatagal) kapag tatapak sa gas lalo kapag akyatin at mag-oovertake, then noticeable yung loss of power lalo na pag accelerating. Some days normal sya, some days hindi. Lumalabas yung sakit lalo na pag-long drive, seems ok on short level trips though. I suspect fuel pump, kase parang kinakapos at bagal umakyat ng rpm. Ok naman air filter, sparkplugs and no CEL is present. Some say might be dirty fuel tank. Ano kaya?

harimon,
with a car that age, the fuel filter should have been replaced at least three times and the ignition cables maybe two times. check the expendables first. the spark plug wires are due around 100k kilometers.
jick

[harimon21]

Thanks Jick
Have ruled out those you mentioned. I have replaced the fuel filter less than 2 years ago and the spark plug wires just 3 months ago, but still no luck

[Tincan]

Driving a lancer 91 EFI. Lately may intermittent problem sya na di ko maintindihan. Naeexperience ko with more frequency lately na ung engine parang sinisinok and nagjejerk (di naman nagtatagal) kapag tatapak sa gas lalo kapag akyatin at mag-oovertake, then noticeable yung loss of power lalo na pag accelerating. Some days normal sya, some days hindi. Lumalabas yung sakit lalo na pag-long drive, seems ok on short level trips though. I suspect fuel pump, kase parang kinakapos at bagal umakyat ng rpm. Ok naman air filter, sparkplugs and no CEL is present. Some say might be dirty fuel tank. Ano kaya?

Subukan mo drain mo ung fuel tank mo para mapalitan ung gas to rule out ung dirty fuel tank/water in tank. kadalasan naman may drain plug ang mga gas tank sa ilalim sa lowest point nito. Tapos lagyan mo na ng gas paka drain mo bili ka ng fuel system treatment/gas treatment parang STP sa ACE meron nun ihalo mo lang sa gas. Panglinis un ng injectors pero damay na rin ang tangke. Kapag ganun pa rin cguro fuel pump na talaga.

[jick.cejoco]

Driving a lancer 91 EFI. Lately may intermittent problem sya na di ko maintindihan. Naeexperience ko with more frequency lately na ung engine parang sinisinok and nagjejerk (di naman nagtatagal) kapag tatapak sa gas lalo kapag akyatin at mag-oovertake, then noticeable yung loss of power lalo na pag accelerating. Some days normal sya, some days hindi. Lumalabas yung sakit lalo na pag-long drive, seems ok on short level trips though. I suspect fuel pump, kase parang kinakapos at bagal umakyat ng rpm. Ok naman air filter, sparkplugs and no CEL is present. Some say might be dirty fuel tank. Ano kaya?

have your engine vacuum checked. it usually tells if the exhaust system is clogged, if the valve timing is off or tell you if the ignition timing is off but confirm with a stroboscopic tilming light. also check your ignition coil output. these should have been done when you had a tuneup specially it was giving you sluggish engine performance

[incus]

you can also try checking yun fuel pump relay, ganyan din problem ko dati
lahat na tiningnan yun pala sunog na yun relay. hth.

[harimon21]

Sorry for this dumb question, but where can I find the fuel pump relay? Also, my gas tank is acting weird lately. When gassing up, the pump would always automatically stop midway upon filling. The gasoline boy would say the tank is full but it is actually not! Hmm?

[Tincan]

Sorry for this dumb question, but where can I find the fuel pump relay? Also, my gas tank is acting weird lately. When gassing up, the pump would always automatically stop midway upon filling. The gasoline boy would say the tank is full but it is actually not! Hmm?

Kapag sunog na ang relay di na gagana totally ang fuel pump mo. ang ginagawa kse ng relay connection lang siya direct sa battery at pinabababa nya ang amps sa mga switch mo at wires mo para hindi lang ito masunog. So kung sunog ang relay ng Fuel pump mo, putol na connection, dapat di na tumatakbo yang auto mo. Tingin ko linisin mo muna gas tank mo. Kse pate ung guage sa loob ng fuel tank mo nagloloko. And wala naman CEL dba? kse kung tune up kailangan nyan or sensors, vacuum, ignition timing...etc. meron na dapat Check Engine light sa panel guage mo.

Anyway, nabaha ba auto mo?

[jick.cejoco]

Sorry for this dumb question, but where can I find the fuel pump relay? Also, my gas tank is acting weird lately. When gassing up, the pump would always automatically stop midway upon filling. The gasoline boy would say the tank is full but it is actually not! Hmm?

harimon,
your fuel filler neck is equipped with a restrictor so you won't be able to pump leaded fuel into the tank, that causes the gas station nozzle to trip, also, the kinks and bends of the filler neck makes the flowing gasoline into the tank create a backpressure simulating a full tank. as for the location of the fuel pump relay, it is on the right side of the console in front of the shifter
jick

[harimon21]

Di naman nabaha yung car. Had checked the relay and its ok. Strange, pag sinusumpong sya what I do is pull over, shut the engine, wait a few minutes, restart then ok na uli. haay

[Tincan]

Di naman nabaha yung car. Had checked the relay and its ok. Strange, pag sinusumpong sya what I do is pull over, shut the engine, wait a few minutes, restart then ok na uli. haay

Yeah, the fuel pump relay should work or else your car wont start like what I said. Did you try cleaning the tank the way that I said? Check mo mga sinabi ko mag back read ka it might work. Its just probably a dirty fuel tank or just impurities in your gasoline.

[t2erns]

check mo rin ang fuel mo baka may tubig lalo na kung yung may e10 ang kinakarga mong gas, marami din gas station ang mga nabaha at nahaluan ng tubig. considering the quality ng gasoline natin kailangan madalas magpalit ng fuel filter

[incus]

naayos na ba ang problem ng TS ? ano talaga ang culprit ?

[paulgozon]

Your problem is very hard to diagnose, because its intermittent, the window of opportunity for the technician/mechanic to diagnose the problem is very small. The symptoms you gave are general symptoms for fuel system and ignition systems. As your car is aged enough there are more probable cause of the problems. One way to limit our guess is to put a test pump pressure gauge in the fuel after the filter, these should be of good grade and semi-permanent to eliminate fire. Drive you car the normal way until the symptoms arises and check the pressure of the fuel, it should be somewhere between 35 to 45 psi, anything lower than this would indicate problem in the fuel system or its electrical circuit controlling the fuel pump.

[harimon21]

you are right paulgozon. very difficult to diagnose. have drained gas and cleaned tank, no luck still. I am now looking at a possible MAF sensor problem, as I have read it causes symptoms I have mentioned

[hapahopi]

almost same symptoms sa akin, 2003 REVO SR A/T.
intermittent na namamatay ang makina habang umaandar at pahinga lang ng konti ay mag-iistart na sasakyan. but lately, hard starting sa umaga at may ingay akong naririnig sa linya papuntang EFI. pag nawala ang ingay ay mag-iistart na siya. napalitan na fuel filter, battery check ay ok at huling ginawa ay starter pero ganun pa din.

[paulgozon]

almost same symptoms sa akin, 2003 REVO SR A/T.
intermittent na namamatay ang makina habang umaandar at pahinga lang ng konti ay mag-iistart na sasakyan. but lately, hard starting sa umaga at may ingay akong naririnig sa linya papuntang EFI. pag nawala ang ingay ay mag-iistart na siya. napalitan na fuel filter, battery check ay ok at huling ginawa ay starter pero ganun pa din.

Assuming you have a good starting system, sa umaga pag-hindi siya start try open a bolt on the fuel line (either the filter or common rail) and see if there is a pressurised gasoline. If you don't know how to do it, go to your favorite shop and let them know of your intention so that they can help you with it. We are trying to isolate the problem by first checking if the problem is from the fuel pump.

you are right paulgozon. very difficult to diagnose. have drained gas and cleaned tank, no luck still. I am now looking at a possible MAF sensor problem, as I have read it causes symptoms I have mentioned

Find a good shop to install a test pressure meter and install also a test bulb on the positive line wire of the fuel pump. Drive the car until the symptoms arises, if the test bulb is not lit and the test pressure is below 35psi, problem is with the electrical line supplying to the fuel pump, if the test bulb is lit and pressure on test meter is below 35psi, fuel pump is the culprit. If test light is lit and pressure is about 35psi, problem is not the fuel system, it could be the ignition system or something else, but first we must do the fuel system test first.

[hapahopi]

almost a year na din bago yung huling nangyari sa akin ito. pinatingin ko sa toyota at wala rin silang nahanap. ang ginawa nila ay 'nilinis' lahat under the dashboard. umayos siya at ngayon lang bumabalik ulit.

[harimon21]

Sinok is getting more frequent and worse. Today I have to stop-start 4 times during 15 km of highway travel just to go to office. The mechanic advised me to replace first the fuel filter and so I did this morning. Ganun pa rin. Sign of the pump nearing its useful life? To the mechanic uli bukas.

[hapahopi]

[quote=paulgozon;1407609]Assuming you have a good starting system, sa umaga pag-hindi siya start try open a bolt on the fuel line (either the filter or common rail) and see if there is a pressurised gasoline. If you don't know how to do it, go to your favorite shop and let them know of your intention so that they can help you with it. We are trying to isolate the problem by first checking if the problem is from the fuel pump.


dinala ko kanina sa car repair dahil dalawang beses namatayan sa daan at hirap din magstart. chineck nila ang fuel pressure at malakas naman ang sirit ng gas. pinacheck ko sa electrician sabi niya maluwang yung connection sa computer box. sinecure niya at umuwi na kami. under observation as of now.