sinc1964 Posted September 6, 2005 Report Share Posted September 6, 2005 Finally got the Grinnall TR7 V8 up and running last night, after being asleep for 6 months - the car not me - and the electric fuel pumps sounds like a machine gun !! It still appears to work fine, forces fuel through etc and the engine runs fine, but does anyone have any ideas where the noise suddenly came from. Is the pump just on its last legs. Pump is located in the engine bay on the bulk head. Cheers, Karl. Quote Link to post Share on other sites
Guest hodgie Posted September 6, 2005 Report Share Posted September 6, 2005 A glugging/ tapping sound right? if so, mine started doing the same. Thought i had tappet problems! Haven't replaced it yet, no idea what it is but seems to have run on for several months with no problems. i suspect it may pack in eventually or not give enough pressure at high revs but so far so good! Not much help i know, but you're not alone! Quote Link to post Share on other sites
anthonyt Posted September 7, 2005 Report Share Posted September 7, 2005 If it is a high volume pump thats what they do! The one on my race car sounds similar but has since it was new. Quote Link to post Share on other sites
sinc1964 Posted September 7, 2005 Author Report Share Posted September 7, 2005 Thanks, I have a spare just in case the worst happens. It is a high volume pump, perhaps it has made the noise for a long time, the large bore exhaust probably hid the noise when the bonnet was down. Quote Link to post Share on other sites
andrewt Posted September 8, 2005 Report Share Posted September 8, 2005 If it is a Facet pump, then it works by using a solenoid to shuttle a ball or bullet back & fore in order to displace the fuel. The noise you hear is the ball reaching the end of its stroke. it is normal & can be reduced by mounting the pump on rubber bobbins (as supplied from new) my experience is that it is a good idea to mount this kind of pump at the rear of the car where it is better fed by gravity. Also they are not very good at sucking (but will pump for ever) and if the fuel evaporates in the line & creates a temporary vapour bubble, the pump will be louder as it tries to pump vapour instead of liquid. This effect is also heard when trying to prime the pump from empty. Andy Quote Link to post Share on other sites
sinc1964 Posted September 8, 2005 Author Report Share Posted September 8, 2005 Thanks Andy. The pump is a Facet one, and the fuel lines were replaced recently so I guess there may also be air in the pipes somewhere. The pump is bolted straight to the bulkhead without any rubber bushes etc, so I will try to relocate it to the boot. It also gets quite warm in the engine bay, so that can't help either.Cheers, Karl. Quote Link to post Share on other sites
andrewt Posted September 9, 2005 Report Share Posted September 9, 2005 The best place for it, from a functional point of view is on the bulkhead below the tank. the disadvantage of this is it gets all the road salt etc on it. when it is here the fuel naturally gravitates to it, or rather any air bubbles settle elsewhere! Mount it on a couple of small bobbins to insulate the noise. A motor factor will give you these for a mini exhaust hanger if you can't get anything else. Cheers Andy Quote Link to post Share on other sites
malcolm Posted September 9, 2005 Report Share Posted September 9, 2005 My V8s have also had the same Facet 'clicking' pump. You'll also find the noise gets much louder as you run out of fuel.... Malcolm. Quote Link to post Share on other sites
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