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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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stupid loud fuel noise
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Sat, 21 May 2005 14:00
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I'd love to pick the brain of anyone who can suggest what my next step should be.
The problem is when the fuel pump is running I have a *really* loud noise coming from the back - basically sounds like rushing fuel. The pump was new, and has been replaced and tried in assorted locations, so that has pretty much been ruled out. There's tons of fuel coming back through the return line and the engine doesn't lean out even at full power, so no issues there. The same model pump has been fitted to another ma61 making similar power (joorsh's) and he has no sound.
The only thing I can really think of is perhaps there's a small blockage in the fuel lines causing the fuel to have to push past it, making noise? The car sat for unknown months without being used... is it possible some sort of build up has partially blocked the lines? I really don't want to goto the trouble of replacing them and find out the noise is still there.
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Location:
Brisbane
Registered:
February 2003
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Re: stupid loud fuel noise
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Sat, 21 May 2005 14:02
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changed the fuel filter?
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Sat, 21 May 2005 14:11
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noise is coming from the back half of the car, but yes the fuel filter is new
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Location:
Brisbane
Registered:
February 2003
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Re: stupid loud fuel noise
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Sat, 21 May 2005 23:22
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pump intake could have too much crap in it causing the pump to work over time and cavitate - highly unlikely
how full is the tank? the return line sprays into the tank from the top - sure you haven't hooked up the return line to the vapour outlet by accident?
pump was fitted without any of the noise isolaters?
fuel doesn't go off and hard - methanol turns to jelly if there's enough water around - is unlikley to form a hard deposit unless left to sit for months. Petrol might takes years to 'go hard' and would need heaps of pollutants to find something to react with suitably.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Sat, 21 May 2005 23:33
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it makes the noise whether the tank has 5 litres or 35 litres in it. pump has been fitted with and without noise insulaters - no change. I think the shell was left for over a year, with no engine in it for a decent bit of that time.
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Registered:
August 2002
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Re: stupid loud fuel noise
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Sat, 21 May 2005 23:36
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I can confirm that it is a very scary loud noise and i have no idea what the hell it is.
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Location:
Brisbane
Registered:
February 2003
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Re: stupid loud fuel noise
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Sat, 21 May 2005 23:48
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remove pump - replace?
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Location:
Brisbane
Registered:
April 2004
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Re: stupid loud fuel noise
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Sat, 21 May 2005 23:53
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Do you have a fuel pressure guage does it make the same noise with the fuel line goin into a bucket?
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Sun, 22 May 2005 00:03
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chuck:
| draven wrote on Sun, 22 May 2005 00:00 |
The pump was new, and has been replaced and tried in assorted locations, so that has pretty much been ruled out.
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as in it was a new pump and making this noise, so I replaced it with another new one.
I don't have a fuel pressure guage handy, no. Interestingly, there is no noise when the pump is fitted to the tank and run prior to re-installing the tank.
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Location:
Brisbane
Registered:
April 2004
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Re: stupid loud fuel noise
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Sun, 22 May 2005 00:21
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Fuel regulator will be my guess
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Sun, 22 May 2005 00:53
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so... it is restricting the flow too much?
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Location:
Brisbane
Registered:
April 2004
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Re: stupid loud fuel noise
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Sun, 22 May 2005 01:12
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Yes thats wats on my mind if you put a pressure guage in line you reading could be high giving the noise of a loaded pump. Is the car running funny/rich?
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Sun, 22 May 2005 01:19
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car has just been tuned - it is running perfectly.
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Location:
Melbourne
Registered:
May 2002
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Re: stupid loud fuel noise
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Sun, 22 May 2005 06:44
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does the the JZ use a J pipe mounted on the block for the fuel return line? that may still have the restrictor in it, secondly check for lose fuel lines vibrating agentst the body
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Sun, 22 May 2005 06:46
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I'll have a look-see allan
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: stupid loud fuel noise
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Mon, 23 May 2005 00:45
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If you change the regulator, make sure you nip back to the dyno and get it retuned.
if the fuel pressure changes by a few psi, it will fuck up your tune.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Mon, 23 May 2005 00:49
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ugh!
wonder if I can deal with that noise until turbos and injectors get upgraded?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: stupid loud fuel noise
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Mon, 23 May 2005 00:51
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Does it do it at idle?
Or only under load?
If its at idle, jack the car up, and go a length of hose.
Put one end in your ear, and the other end on various things on the fuel system.
You'll figure out exactly where the noise is coming from in no time.
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: stupid loud fuel noise
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Mon, 23 May 2005 05:34
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sorry if this has been brought up, but how big is your return line?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: stupid loud fuel noise
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Mon, 23 May 2005 05:36
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| shinybluesteel wrote on Mon, 23 May 2005 13:34 |
sorry if this has been brought up, but how big is your return line?
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If its stock, and unkinked, its well big enough.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: stupid loud fuel noise
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Mon, 23 May 2005 12:47
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yeah, it's stock - but there are plenty of ma61 owners out tehre running big fuel pumps without this issue (in fact, I think I'm the first to have it). will check the J-pipe when I get a spare few moments.
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