Fuel Pump

[Watwheels]

4 minutes ago, Micb said:

It's an old COE'd 2008 Camry.   The car runs fine most of the time (except for the jerking at 80km/h) and the rpm is stable, so not suspecting the coil plugs.  

There is no CEL or codes, except once in a long while, can hear a clack clack sound which last only 1-2 secs, during morning start.

The ws which did the parts change, is a OMO old school mechanic based on experience.   He does not have the correct tools to diagnose, thus need a more professional approach.

 

 

 

It is a common vvti timing cam issue if you Google the make year and model. One of the two cam gear get stuck due to wear and tear when the hydraulic pressure is applied.

[Volvobrick]

2 hours ago, Micb said:

Hi there,

Anyone can recommended a workshop that can perform a proper fuel delivery and pressure test? 

The family camry has the following issues:

- Difficulty starting in morning or when engine is cold.  It takes a longer crank and when it turns over, engine will sputter as if not enough fuel (rpm very low) and dies out.  It will then start as normal again.

- When travelling on constant throttle between 78 - 85 km/h range, the rpm will fluctuate causing the car to jerk.  The jerking issue will go away if the throttle pedal is released or by increasing speed to 90km/h.

So far, we had changed the MAF sensor, cleaned the fuel injectors and throttle body, and the in-tank fuel filter.    Spark plugs are less than 20k.

I plug in a simple OBD reader, and no CEL or codes.  But noticed that the Long Term Fuel Trim (LTFT) is very high, always around 18-20%, which means the engine is running lean (learnt from the web).

So, need help here to recommend a proper WS with good knowledge on fuel pressure diagnostics.

Thank you.

Could be fuel pressure sensor. Happened to me. 

 

If cheap then replace and see how. 

Edited February 17, 2023 by Volvobrick

[Kklim]

Just had fuel pump replaced together with upstream oxygen sensor and PCV valve. Engine mati while moving fortnight ago. Luckily traffic was very light and I could pull over to shoulder without incident. Managed to fire up engine and continued on my journey. Googled and faulty fuel pump came up as most probably reason. But workshop couldn't find any fault and there were no CEL or other warnings. Decided to replace for peace of mind. Too soon to tell but engine does seem more responsive, esp on highway.

[Gnahp]

On 1/3/2025 at 3:23 PM, Kklim said:

Just had fuel pump replaced together with upstream oxygen sensor and PCV valve. Engine mati while moving fortnight ago. Luckily traffic was very light and I could pull over to shoulder without incident. Managed to fire up engine and continued on my journey. Googled and faulty fuel pump came up as most probably reason. But workshop couldn't find any fault and there were no CEL or other warnings. Decided to replace for peace of mind. Too soon to tell but engine does seem more responsive, esp on highway.

my ex ex ex car experienced similar symptoms 

engine will start and run normally from cold, sometimes engine will stall as if someone switch off the ignition (no struggle, no vibration, no rpm drop) while waiting at the traffic lights, will restart immediately and run fine for the rest of the day. Sometimes unable to restart after parked, engine will crank but won't fire, if I let it cool down for half an hour, it will start and run fine, for the rest of the day again

no CEL

I suspected fuel pump too but at the end it was the crankshaft position sensor, after replacement it ran sui sui till I traded in the car

 

[mersaylee]

On 1/3/2025 at 3:23 PM, Kklim said:

Just had fuel pump replaced together with upstream oxygen sensor and PCV valve. Engine mati while moving fortnight ago. Luckily traffic was very light and I could pull over to shoulder without incident. Managed to fire up engine and continued on my journey. Googled and faulty fuel pump came up as most probably reason. But workshop couldn't find any fault and there were no CEL or other warnings. Decided to replace for peace of mind. Too soon to tell but engine does seem more responsive, esp on highway.

 

On 1/3/2025 at 5:20 PM, Gnahp said:

my ex ex ex car experienced similar symptoms 

engine will start and run normally from cold, sometimes engine will stall as if someone switch off the ignition (no struggle, no vibration, no rpm drop) while waiting at the traffic lights, will restart immediately and run fine for the rest of the day. Sometimes unable to restart after parked, engine will crank but won't fire, if I let it cool down for half an hour, it will start and run fine, for the rest of the day again

no CEL

I suspected fuel pump too but at the end it was the crankshaft position sensor, after replacement it ran sui sui till I traded in the car

 

Replacement without error code is a wild goose chase...😅

[inlinesix]

My previous E39 fuel pump mati at 10pm at the junction of Beach Road and Tan Quee Lan Street.

I finally know how heavy is 1.5 tonne.

[Gnahp]

On 1/3/2025 at 5:29 PM, mersaylee said:

 

Replacement without error code is a wild goose chase...😅

aka tikam

this is when the mechanic's knowledge and experience worth the money

but some people will say, aiyer, remove one screw, unplug/plug one connector only, why charge $100 for labour?

they have forgotten accurate diagnosis also got value, substantially

[Gnahp]

On 1/3/2025 at 5:31 PM, inlinesix said:

My previous E39 fuel pump mati at 10pm at the junction of Beach Road and Tan Quee Lan Street.

I finally know how heavy is 1.5 tonne.

and also noticed the road that you drove everyday for the past 20 years got a bit upslope that you never aware at all 😁

[Kklim]

On 1/3/2025 at 3:23 PM, Kklim said:

Just had fuel pump replaced together with upstream oxygen sensor and PCV valve. Engine mati while moving fortnight ago. Luckily traffic was very light and I could pull over to shoulder without incident. Managed to fire up engine and continued on my journey. Googled and faulty fuel pump came up as most probably reason. But workshop couldn't find any fault and there were no CEL or other warnings. Decided to replace for peace of mind. Too soon to tell but engine does seem more responsive, esp on highway.

BTW car is 15 years ago, with odometer at 223k km. Have had the car for about 10 years

[mersaylee]

On 1/3/2025 at 5:31 PM, inlinesix said:

My previous E39 fuel pump mati at 10pm at the junction of Beach Road and Tan Quee Lan Street.

I finally know how heavy is 1.5 tonne.

Did you try carry it home on your shoulder...? 😂

Next time if hard to push forward...try the reverse...😁

[Gnahp]

On 1/3/2025 at 6:09 PM, Kklim said:

BTW car is 15 years ago, with odometer at 223k km. Have had the car for about 10 years

I just checked my record

it happened when the car was 5 years old, 200k km

[Mkl22]

On 1/3/2025 at 5:20 PM, Gnahp said:

my ex ex ex car experienced similar symptoms 

engine will start and run normally from cold, sometimes engine will stall as if someone switch off the ignition (no struggle, no vibration, no rpm drop) while waiting at the traffic lights, will restart immediately and run fine for the rest of the day. Sometimes unable to restart after parked, engine will crank but won't fire, if I let it cool down for half an hour, it will start and run fine, for the rest of the day again

no CEL

I suspected fuel pump too but at the end it was the crankshaft position sensor, after replacement it ran sui sui till I traded in the car

 

This one is notorious problem of the Mercedes m112 engine. 

[Mkl22]

On 1/3/2025 at 6:09 PM, Kklim said:

BTW car is 15 years ago, with odometer at 223k km. Have had the car for about 10 years

What model? Sometimes certain models have inherent problems. 

[Kklim]

On 1/3/2025 at 8:43 PM, Mkl22 said:

What model? Sometimes certain models have inherent problems. 

Nissan Sylphy G11 1.5L auto

[Mkl22]

On 1/3/2025 at 9:16 PM, Kklim said:

Nissan Sylphy G11 1.5L auto

I would have cleaned throttle body first. 
for fuel pump it typically is working or not. Not in between unless filter flogged. But if filter clogged then you will only get fuel starvation if you floor it. If idling that bit of fuel can still get thru won’t suddenly die. 
thus more like a air flow. Not a spark problem as you don’t have misfire or jerkiness. 

Edited January 3, 2025 by Mkl22

[Kklim]

On 1/3/2025 at 10:14 PM, Mkl22 said:

I would have cleaned throttle body first. 
for fuel pump it typically is working or not. Not in between unless filter flogged. But if filter clogged then you will only get fuel starvation if you floor it. If idling that bit of fuel can still get thru won’t suddenly die. 
thus more like a air flow. Not a spark problem as you don’t have misfire or jerkiness. 

TB and MAF sensor were cleaned months before the engine died while on the road. I drive to Malaysia every few weeks (in-laws live there) so didn't want to take the risk of it happening again while I was overtaking a fuel tanker on NSH with an express bus on my tail 😜

Total bill was RM880 still can't complain.

[mersaylee]

Sometimes...infact most times... when cleaning TB can cause more harm than good especially if it involves removal for cleaning...I'd just spray gunk remover directly onto the butterfly flaps if accessible without any removal...very often mechanic simply plug the connector back without ensuring a good fit...making its operation not optimised properly...some shops lagi worse...dip the entire TB into a tub of cleaning detergent...causing the sensor to fail shortly after...

[samalfman]

@kobayashiGT quick question, did your fuel pump issues affect your MPG in the short term?