[Healeys] Running Problem

[warthodson at aol.com]

Two comments to your original post.The carb float bowl overflow pipe cannot "siphon" fuel out of the float bowl. It only drains excess fuel out when for example the float valve does not seat correctly.You cannot blow fuel/air backward thru an SU fuel pump. It's internal valves act as a check valve preventing reverse flow. I am not familiar with the operation of the aftermarket pump you also have installed. Is in in series or in parallel with the SU? Do you have an original gas tank? Has it been internally coated?Gary Hodson 
-----Original Message-----
From: Perry via Healeys <healeys at autox.team.net>
To: Brian Drab <bgdrab at redzone.ca>; healeys at autox.team.net <healeys at autox.team.net>
Sent: Fri, May 29, 2020 7:00 am
Subject: Re: [Healeys] Running Problem

#yiv3340997581 #yiv3340997581 -- _filtered {} _filtered {}#yiv3340997581 #yiv3340997581 p.yiv3340997581MsoNormal, #yiv3340997581 li.yiv3340997581MsoNormal, #yiv3340997581 div.yiv3340997581MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv3340997581 a:link, #yiv3340997581 span.yiv3340997581MsoHyperlink {color:blue;text-decoration:underline;}#yiv3340997581 .yiv3340997581MsoChpDefault {} _filtered {}#yiv3340997581 div.yiv3340997581WordSection1 {}#yiv3340997581 BrianWith the info you provided there isn’t to many “causes” that would fit those parameters. Fuel on the ground under the front of the car---very over rich situation at the carbs, likely a float needle stuck open. Not sure if the fuel spill happened when the ignition was on or off.When it does start, runs rough. You didn’t mention if it was belching black smoke out the tailpipes.  Could be lean or rich but since you mentioned the spark plugs looked OK suspect lean condition ---Suspect clog at the float needle. It only takes a very small flake of rust or crud to block them or hold them open.The carbs really don’t care if a bit of air is being sucked through the fuel line as long as the carb bowl stays at the proper fuel level in the float chamber.Did you collect a sample of the fuel when you ran the pump with the fuel line disconnected? Wasn’t sure what “ran clear” meant other than no bubbles. Was it a visual observation or inspected sample.I’m leaning towards a rusty fuel tank or accumulated crud in the fuel system. As others mentioned, a filter between the pump and carb will remove the offending substances before it gets to the one place that makes the engine act up, fuel wise.Perry  Sent from Mail for Windows 10  From: Brian Drab
Sent: Thursday, May 28, 2020 8:57 PM
To: healeys at autox.team.net
Subject: [Healeys] Running Problem  I guess I wasn’t too clear on something in my first post I only smelled raw gas once and it only leaked fuel once. Since then I have searched for some source of fuel leakage but can’t find any. I was thi8nking that it might be sucking air as well as gas through some hole in tank to pump lines, but when I checked the fuel delivery it ran clear with no air bubbles in the gas..Brian Drab    _______________________________________________
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