[Healeys] Fuel pumps (AGAIN!)

[warthodson at aol.com]

If the float needle/seat leaks I can understand that the fuel level in the float bowl could rise & that would affect the idle & mixture. However, if they are not leaking & assuming your float bowels are correctly vented, I do not see any way that the pressure of the pump (if it is within factory specifications) would affect the "float buoyancy". The pressure in the float bowl is atmospheric pressure, not pump pressure.Gary Hodson 

-----Original Message-----
From: Larry Varley <varley at cosmos.net.au>
To: michaelsalter <michaelsalter at gmail.com>; healeys <healeys at autox.team.net>
Sent: Thu, Nov 29, 2018 8:28 pm
Subject: Re: [Healeys] Fuel pumps (AGAIN!)

#yiv9667186109 #yiv9667186109 -- _filtered #yiv9667186109 {font-family:Wingdings;panose-1:5 0 0 0 0 0 0 0 0 0;} _filtered #yiv9667186109 {font-family:Wingdings;panose-1:5 0 0 0 0 0 0 0 0 0;} _filtered #yiv9667186109 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} #yiv9667186109 #yiv9667186109 p.yiv9667186109MsoNormal, #yiv9667186109 li.yiv9667186109MsoNormal, #yiv9667186109 div.yiv9667186109MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;font-family:New;} #yiv9667186109 a:link, #yiv9667186109 span.yiv9667186109MsoHyperlink {color:blue;text-decoration:underline;} #yiv9667186109 a:visited, #yiv9667186109 span.yiv9667186109MsoHyperlinkFollowed {color:purple;text-decoration:underline;} #yiv9667186109 span.yiv9667186109EmailStyle17 {color:#1F497D;} #yiv9667186109 .yiv9667186109MsoChpDefault {} _filtered #yiv9667186109 {margin:72.0pt 72.0pt 72.0pt 72.0pt;} #yiv9667186109 div.yiv9667186109WordSection1 {} #yiv9667186109 Hi Mike. Naturally you have an SU pump test rig J image attached. All I can tell you for certain is that reducing the pressure makes a considerable difference. Both cars need to run on choke for longer after cold start and both have a stable and repeatable  idle speed and at running temperature. Both also have new needle and seats in the carbs and set correctly. I’m not saying they necessarily leak but I do think the extra pressure causes a higher fuel level at idle simply due to float buoyancy and very little fuel being used. In the end what good is more pressure than you need? As long as you get enough flow you don’t need the pressure. CheersLarry Varley_______________________________________________
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