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MG MGB GT V8 Factory Originals Technical - ROVER FUEL INJECTION - TICKING
|Changed the fuel delivery line over the weekend - car goes as well as ever however there is a not too loud but still irritating ticking noise inside the car comes from bulkhead. I assume its a noise short from the pressure relief valve at the end of the fuel rail - anyone know what it's trying to tell me ?|
PS Range Rover 3.9 with all standard gear
|"feed me"? :)|
|Ticking noises mine makes|
The carbon cannister valve makes a faint tick noise which might get louder if it were failing or may be the idle control air bypass valve (forgotten what it's called, thing on the back of the phenum cover)makes a brief ticking noise when I switch on the ignition ie connection knocked loose when attaching fuel line or at one stage my speedo was making anoying ticking noises which appeared one day for no particular reason and then went away again without explaination (the Ghost in the machine!).
|Peter / Justin|
I should have explained that the fuel lines are secured to the bulkhead in front of the heater - the noise travels along the fuel lines an reverberates inside the car - the frequency of the noise is about 3bts/sec and the only logical explanation is the pressure relief valve on the fuel rail or the bosch HP pump at the other.
Not sure whether you are trying to identify a potential fault or just get rid of the tick.
If you have a metal fuel pipe from the pump forward to the engine bay it could be that its a metal to metal contact that using the bulkhead as an amplfier.
If the clips used to secure the pipe at the bulkhead are straight onto the pipe/s you could try insulating with some short lengths of fuel hose as insulators and use larger P clips if necessary. Also worth checking the pipe is not vibrating against the transmission tunnel, the source of a noise is not necessary where you here it if that makes sense.
I can get rid of the noise short (fuel line to bulkhead) I just don't know whether the clicking is telling me that somethin is wrong - I suspect there is a mechanical valve in the pressure relief valve which is even more stressed than me !
Oh the joys of MG motoring !
Could it be a symptom of paranoia. I seem to suffer from it on occasion, any change in engine note, eyes glued to the oil pressure guage etc etc, all part of the fun of old MG ownership. Have only recently noticed that my policy with Footman James includes roadside recovery in the UK and Europe so I suppose the answer is just drive it until it stops, and if I cant fix it call the emergency No. I shall try to stop worrying, anyway no current! problems with the electrics at the moment, once started it now keeps going.
Have you tried temporarily joining the high pressure fuel line to the return line with a spare bit of fuel line and running the pump(s)?
Not hard or time consuming and that at least would eliminate or confirm that the pressure relief valve is the source of the ticking.
Just a thought, the new fuel line is right size?
|Peter - good idea - the noise (sounds a bit like water hammer) is being transmitted by both hoses - can't be sure that the return line is noisiest - the new supply line is the same size as the last but with fewer sharp bends so that the supply if anything is better - the return line might have got slightly pinched when it was put back so I will investigate that too.|
Car goes well and as soon as you move off the noise is drowned or stops (can't tell which).
Thanks for your thoughts.
This thread was discussed between 18/07/2005 and 25/07/2005
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