Re: [doc] Re: Gaydon and Noisy Fuel Pump

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Mike Bosworth wrote:

> >
> > Yes, and I remain puzzled by the fact that our alternator "didn't
> fit" -
> > it went on another car perfectly, and I now have one on mine.
>
>
> Whilst i wasnt actually refering to any suppliers particular
> alternator, only the OEM to Aftermarket debate that rumbles on on
> various newgroups and whos alternator is the 'best to go for'...Yes
> it is very strange that one, im assuming this is the same type of
> alternator you are now selling as a replacement on your site. 

It's the same alternator, albeit we're now buying in the pulleys from 
Renault too.

> All i
> will say ,now you have brought it up is that we couldnt get it to 
> work or fit correctly on my car , one reason being due to
> its 'larger' size and the fact the belt i had previously bought from
> you wouldnt get taught enough because the alternator was hitting the
> side of the engine bay. 

Are you -sure- you weren't trying to use an AC belt? We do both belts 
and the alternator belt is slightly thinner and shorter than the AC 
belt. The guys on the LeMans trip watched me change mine out on the sode 
of the road last week. (my car really is an example of the painter who 
never paints his own house :-)

> With a shorter belt i obtained, i then got
> no output voltage from it. Even had two other people check this out
> for me... Anyhow despite the mystery, Im pleased it is now running
> for you.

Yes, we put it on another car, exactly as it came back from you and had 
no problem at all. On my car, I still had the Ducellier plug on the back 
and it was just a case of un-plugging the old alternator (this was the 
biggest mission!) and plugging in the new one. No wiring mods or 
anything needed. It does use the 2-pin plug and if you get them the 
wrong way around, it will not work.

> The one i was supplied with my origional new pick up hose etc may as
> well have been the size of a 1p piece , this being the effective
> surface area of the suction through it, Still feel a lot of people
> have this 'pancake' filter in the tanks may be worth updating this.

I've never seen a pickup filter that didn't have wadding inside to keep 
it "open"

> > A poor baffle effectively reduses the usable volume of your tank.
>
>
> Be intersting to work this out, not sure how to thou :) , 

What I mean is that if you have a poor baffle, you can't run the tank as 
low, therefore making the usable volume less.

> my filter
> still sits in bottom of the tank just not now in the dead centre, (
> im assuming the old baffle arrangement is?... 

Yes - that's why it's so convoluted!

> On the occasions i have had to run down to the 'light' ive not
> noticed any problems but like i say it wasnt going uphill on the
> moors... I suppose if the origional arrangement is prone
> to 'singing' below half full then its obviously best not to run the
> fuel down that low... yes its not always practical not to do so.

Rather than thinknig about driving up/down slopes, think about what 
happens in your car when its low on fuel and you park facing uphill? The 
OEM arrangement has it at the middle of the tank, yours has it at the 
front end.

> (Obviously my new pick up hose is very short )

As long as the hose itself doesn't collapse (which IS a surmountable 
problem with the original setup) fluid dynamics means the actuial length 
of hose makes no difference, only the height of the pickup compared to 
the base of the pump

> Interesting if this heat generated is all by the engine or does the
> fans blowing back from the radiator help compound the problem. The
> old debate on the rad fans / tank shield goes on ....

The tank is heated by three things

1) The engine heat flowing back in the return line
2) The radiator being directly in front of the tank
3) The dirty great coolant pipes running directly beneath the tank

Martin


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