Replacing Fuel Pressure Dampers

[gatubel]

after having to deal with a clicking engine noise for months now, I decided to do some research and noticed that the fuel dampers is a very common failure in muranos.

after reading a few threads I went ahead and checked my muranos dampers.
luckily my girl had an spare stethoscope from school.
She even helped me cuz I wanted to check them while my murano was in gear.

unbelievable , when in gear the clicking was the same noise I had been hearing while my murano but 40 times louder. its a noise you cant hear unless you have astethoscope touching the dampers. no doubt these suckers are responsible for that annoying noise I've been hearing, thinking the whole time it could have been a major engine problem...

Now my question(s) for all those that have replaced them.

how much you paid for them and where did you buy them?
I found this online
03 2003 Nissan Murano Fuel Pressure Damper - Fuel Injection - Standard Motor Products - PartsGeek

how hard were these to be replaced?
and what steps should I fallow?

notice that one of them comes with a hose. Some other websites only show 1 dumper, not both of them.
by the way sorry for my bad English and grammar, as I am still learning English...

any help is appreciated.

[njjoe]

Nice job on diagnosing the problem.

The MO has two fuel dampers - one with a hose and the other without.

Here is a photo of the two dampers:

(Photo courtesy of lilazndemon20)

WorldPartsExpress.com sells the dampers for $64 & $117. I think it was just last week that fellow NissanMurano.org member lilazndemon20 sold a set for $50.

-njjoe

[lino]

hello, I do not explain how the subject interests me! but how the noise enters the car? and why not hear outside??

[Grease Monkey]

Gatubel,

Sweet MacGyver-esque diagnostic procedure! I knew that dating a nurse had more than just one perk to it..

As for the fuel pressure dampers, I never had to replace them on my Murano but my cousin has a '03 and he has recently replaced the said dampers. I actually helped him out a bit with the repair job as well as shopping for replacement dampers. I learned that the problem is more common in Muranos then you'd hope but at least the replacement fuel pressure dampers aren't too pricey. The best price that we found on OEM replacements was $72.01 at nissanpartszone.com.

Anywhoo, here's the procedure that we followed for removing and replacing the fuel pressure damper:

Remove the engine cover.

Release the fuel pressure.

Remove the right windshield wiper arm and the right cowl top cover.

Remove radiator cover grille, air duct (inlet), air cleaner case, air duct assembly and mass air flow sensor.

Disconnect electric throttle control actuator and engine coolant hoses.

Disconnect vacuum hose, fuel injectors electrical connectors, and PCV hose.

Remove the vacuum tank from intake manifold collector (lower).

Disconnect the power steering hose bracket.

Remove the intake manifold collector (upper and lower). The intake manifold collector (upper) should be moved aside with water hoses connected.

Remove fuel feed hose (with damper) from fuel tube.

Disconnect fuel feed hose (with damper) quick connector at vehicle piping side. When separating fuel feed hose and centralized under-floor piping connection, disconnect quick connector with the following procedure:
Remove quick connector cap from quick connector.
Disconnect quick connector from centralized under-floor piping.

Remove harness connector from fuel injector.

Loosen mounting bolts in numerical order in the illustration, and remove fuel tube and fuel injector assembly.

Remove fuel injector from fuel tube with following procedure:
Open and remove clip.
Remove fuel injector from the fuel tube by pulling straight.

Remove fuel damper from fuel tube.



Install fuel damper. Insert fuel damper straight into fuel tube. Tighten mounting bolts evenly in turn. After tightening mounting bolts, make sure that there is no gap between flange and fuel tube. When handling O-rings, be careful of the following:
Handle O-ring with bare hands. Never wear gloves.
Lubricate O-ring with new engine oil.
Do not clean O-ring with solvent.

Make sure that O-ring and its mating part are free of foreign material.

When installing O-ring, be careful not to scratch it with tool or fingernails.

Also be careful not to twist or stretch O-ring. If O-ring was stretched while it was being attached, do not insert it quickly into fuel tube.

Install O-rings on the fuel injector. Upper and lower O-ring are different.

Install fuel injector to fuel tube with the following procedure:
Insert clip into clip mounting groove on fuel injector. Insert clip so that lug “A” of fuel injector matches notch “A” of the clip.

There's a few more steps after that but this is the general run-down of the whole gig. I hope that this helps you out a bit brotha!

[gatubel]

Originally Posted by Grease Monkey

Gatubel,

Sweet MacGyver-esque diagnostic procedure! I knew that dating a nurse had more than just one perk to it..

As for the fuel pressure dampers, I never had to replace them on my Murano but my cousin has a '03 and he has recently replaced the said dampers. I actually helped him out a bit with the repair job as well as shopping for replacement dampers. I learned that the problem is more common in Muranos then you'd hope but at least the replacement fuel pressure dampers aren't too pricey. The best price that we found on OEM replacements was $72.01 at nissanpartszone.com.

Anywhoo, here's the procedure that we followed for removing and replacing the fuel pressure damper:

Remove the engine cover.

Release the fuel pressure.

Remove the right windshield wiper arm and the right cowl top cover.

Remove radiator cover grille, air duct (inlet), air cleaner case, air duct assembly and mass air flow sensor.

Disconnect electric throttle control actuator and engine coolant hoses.

Disconnect vacuum hose, fuel injectors electrical connectors, and PCV hose.

Remove the vacuum tank from intake manifold collector (lower).

Disconnect the power steering hose bracket.

Remove the intake manifold collector (upper and lower). The intake manifold collector (upper) should be moved aside with water hoses connected.

Remove fuel feed hose (with damper) from fuel tube.

Disconnect fuel feed hose (with damper) quick connector at vehicle piping side. When separating fuel feed hose and centralized under-floor piping connection, disconnect quick connector with the following procedure:
Remove quick connector cap from quick connector.
Disconnect quick connector from centralized under-floor piping.

Remove harness connector from fuel injector.

Loosen mounting bolts in numerical order in the illustration, and remove fuel tube and fuel injector assembly.

Remove fuel injector from fuel tube with following procedure:
Open and remove clip.
Remove fuel injector from the fuel tube by pulling straight.

Remove fuel damper from fuel tube.



Install fuel damper. Insert fuel damper straight into fuel tube. Tighten mounting bolts evenly in turn. After tightening mounting bolts, make sure that there is no gap between flange and fuel tube. When handling O-rings, be careful of the following:
Handle O-ring with bare hands. Never wear gloves.
Lubricate O-ring with new engine oil.
Do not clean O-ring with solvent.

Make sure that O-ring and its mating part are free of foreign material.

When installing O-ring, be careful not to scratch it with tool or fingernails.

Also be careful not to twist or stretch O-ring. If O-ring was stretched while it was being attached, do not insert it quickly into fuel tube.

Install O-rings on the fuel injector. Upper and lower O-ring are different.

Install fuel injector to fuel tube with the following procedure:
Insert clip into clip mounting groove on fuel injector. Insert clip so that lug “A” of fuel injector matches notch “A” of the clip.

There's a few more steps after that but this is the general run-down of the whole gig. I hope that this helps you out a bit brotha!

wait a minute... why do I have to do all this whenI can access the dampers by just removing the engine cover?

like the wiper arm, throttle body, intake manifold etc etc. are you sure all this has to be removed?

[Grease Monkey]

Hey man,

I was replacing the fuel injectors as well so this procedure probably included some steps for the injector replacement process as well

[gatubel]

Originally Posted by Grease Monkey

Hey man,

I was replacing the fuel injectors as well so this procedure probably included some steps for the injector replacement process as well

Oh I see. well i took a closer look at my Murano and seems like the only thing I have to take off is the air filter housing. I can see the fuel hose that goes from the damper to the connector without taking anything off. but in order to access the connector the air filter assembly has to come off. I bought a set of fuel line quick disconnect tool set to change a fuel pump years ago, seems like Im gonna be using it for the second time.

[njjoe]

GM-

Nice write-up!

By the way, what is the car in your avatar?

-njjoe

Originally Posted by Grease Monkey

Gatubel,

Sweet MacGyver-esque diagnostic procedure! I knew that dating a nurse had more than just one perk to it..

As for the fuel pressure dampers, I never had to replace them on my Murano but my cousin has a '03 and he has recently replaced the said dampers. I actually helped him out a bit with the repair job as well as shopping for replacement dampers. I learned that the problem is more common in Muranos then you'd hope but at least the replacement fuel pressure dampers aren't too pricey. The best price that we found on OEM replacements was $72.01 at nissanpartszone.com.

Anywhoo, here's the procedure that we followed for removing and replacing the fuel pressure damper:

Remove the engine cover.

Release the fuel pressure.

Remove the right windshield wiper arm and the right cowl top cover.

Remove radiator cover grille, air duct (inlet), air cleaner case, air duct assembly and mass air flow sensor.

Disconnect electric throttle control actuator and engine coolant hoses.

Disconnect vacuum hose, fuel injectors electrical connectors, and PCV hose.

Remove the vacuum tank from intake manifold collector (lower).

Disconnect the power steering hose bracket.

Remove the intake manifold collector (upper and lower). The intake manifold collector (upper) should be moved aside with water hoses connected.

Remove fuel feed hose (with damper) from fuel tube.

Disconnect fuel feed hose (with damper) quick connector at vehicle piping side. When separating fuel feed hose and centralized under-floor piping connection, disconnect quick connector with the following procedure:
Remove quick connector cap from quick connector.
Disconnect quick connector from centralized under-floor piping.

Remove harness connector from fuel injector.

Loosen mounting bolts in numerical order in the illustration, and remove fuel tube and fuel injector assembly.

Remove fuel injector from fuel tube with following procedure:
Open and remove clip.
Remove fuel injector from the fuel tube by pulling straight.

Remove fuel damper from fuel tube.



Install fuel damper. Insert fuel damper straight into fuel tube. Tighten mounting bolts evenly in turn. After tightening mounting bolts, make sure that there is no gap between flange and fuel tube. When handling O-rings, be careful of the following:
Handle O-ring with bare hands. Never wear gloves.
Lubricate O-ring with new engine oil.
Do not clean O-ring with solvent.

Make sure that O-ring and its mating part are free of foreign material.

When installing O-ring, be careful not to scratch it with tool or fingernails.

Also be careful not to twist or stretch O-ring. If O-ring was stretched while it was being attached, do not insert it quickly into fuel tube.

Install O-rings on the fuel injector. Upper and lower O-ring are different.

Install fuel injector to fuel tube with the following procedure:
Insert clip into clip mounting groove on fuel injector. Insert clip so that lug “A” of fuel injector matches notch “A” of the clip.

There's a few more steps after that but this is the general run-down of the whole gig. I hope that this helps you out a bit brotha!

[Grease Monkey]

Thanks, njjoe!

As for the car in my avatar, it is the Honda S500- one of my favourite roadsters of all time. She's a timeless beauty, isn't she?

[YeeMurano]

Hi Gatubel,

Have you installed the damper(s) and if so did it solve your clicking noise? I am also having the same issue and would like to know which damper was at fault or both.

Thanks,
Holden

[GeoMurano]

All, This site is genius. I had the fuel damper problem on my wife's Murano (2005 SL) and I diagnosed it by this board before going to the dealer. The dealer came up with the same diagnosis (of course, I didn't lead them on, as I'm sure they would repair the whole car if I hinted at that). Unfortunatley, I was quoted $700, and yes, I think that was steep. However, my (maybe faulty) logic was this: the car has 88k and the only non-maintenance repair I had to pay for out of warranty was a link arm for about $800. So, for $1,500 over 7 years, I thought was not too bad. Albeit, I probabaly should create a sinking fund for other things.

Anyhow, I have owned Hondas and Volvos and I don't know why I like the Murano so much. I remember the day they delivered our Merlot Red Murano and it sat in my driveway and I thought it was a piece of art that should be in MoMa. I love the room. I love the ride. I think the CVT technology (thank you DaVinci) is pretty well executed in the Murano. I like the composite liftgate. I like the comfortable seats and 5 seat layout (roomy).

[igspit]

Just wanted to chime in real quick on this subject... I have a an '03 MO and had that same annoying noise coming from the engine compartment at 80k. It was actually diagonsed by the dealer but at the time I didn't have the extra $400.00 they were going to charge me so I passed on it. 2 weeks later, I took it to a place that has a certified Nissan technician but has his own shop. He listened to the sound and said it was definately the fuel dampner. Apparently, of the 2 it has, there is one that usually goes out while the other doesn't as often. He had the dampner that usually goes out in stock so he recommended only replacing one for now and seeing if the noise goes away. He charged me $170.00 for the part and $50.00 for labor and I had the car back in 2 hours! I saved $180.00 dollars going there and I'm happy to say that the noise is now gone!

[omatter74]

Originally Posted by igspit

Just wanted to chime in real quick on this subject... I have a an '03 MO and had that same annoying noise coming from the engine compartment at 80k. It was actually diagonsed by the dealer but at the time I didn't have the extra $400.00 they were going to charge me so I passed on it. 2 weeks later, I took it to a place that has a certified Nissan technician but has his own shop. He listened to the sound and said it was definately the fuel dampner. Apparently, of the 2 it has, there is one that usually goes out while the other doesn't as often. He had the dampner that usually goes out in stock so he recommended only replacing one for now and seeing if the noise goes away. He charged me $170.00 for the part and $50.00 for labor and I had the car back in 2 hours! I saved $180.00 dollars going there and I'm happy to say that the noise is now gone!

Just curious is it the one with or with out the hose that went out?