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Fuel Pump-out -- safe to use factory quick-connects?

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#1
tynor

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When I pump out fuel at the track, I've been popping a quick-connect from the pulse dampner on the pax side of the engine.   I'm wondering if there's any risk that repeated connect/disconnect of those fittings might lead to a leak / failure of the connector.   Does anyone else do this?  Any failures? 

 

(many of the folk I paddock with have installed metal scuba quick-connects to their pressure regulators instead - but mine is in the trunk and it's easier to pump out from the engine bay since that's where the diagnostic port that turns the fuel pump on lives...)

 

So far so good..., but looking for advice from the old timers...

 

Thanks!


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#2
TylerQuance

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I would be afraid the plastic clip would not return to grip the nipple after repeated cycles like that. It's the only thing that holds the connector from blowing off.

Just put a test port on the regulator and be done with it.
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#3
ChrisA

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I used the quick disconnect in the engine bay many times, but now use the port on the fuel regulator. I wasn't too worried about the plastic retaining clip breaking so much, because I have spares from fuel filter changes. I was concerned about the O-ring in the fitting getting nicked and leaking. I would typically put a little motor oil on the metal line as lube to protect it some. Now, if you want a quick 'n cheap tank drain method, you could use a .22 to put a hole in the bottom of the tank. The hole should be snug enough to run an 8mm bolt up in there. Put a vinton ring gasket on the bolt and bada-bing bada boom, drain plug and a booking at a Choice hotel.  :devil:


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#4
davew

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I have used this method many times with no problems. i have seen the o-ring get nicked causing a fuel leak. And saw a car go up in flames when the hose popped off. I had a reasonably priced quick release for sale, but had problems with the seals not being compatible with fuel. Caused a couple leaks. I have a new system worked out that uses a fuel campatable double dry break system. Give me week or so to get my head straight.

 

dave


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#5
tynor

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FWIW, I ended up with the MiataCage kit - turns out this is what most of my paddock mates use and it was very simple to install.

 

http://www.miatacage...t-kit-1990-2005


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#6
steveracer

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I forget if it was Lamb or Schiffler who recommended it, but I've been using this method for years.

 

I cut the wire to the fuel gauge and measure the resistance coming from the sender. Spent an afternoon pouring and measuring 1 quart at a time and made a chart from dead dry to 4 1/2 gallons. 

My DVOM is my fuel gauge, I only pump out the stabilized storage fuel when preparing for a race. 


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#7
Tom Hampton

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I forget if it was Lamb or Schiffler who recommended it, but I've been using this method for years.

I cut the wire to the fuel gauge and measure the resistance coming from the sender. Spent an afternoon pouring and measuring 1 quart at a time and made a chart from dead dry to 4 1/2 gallons.
My DVOM is my fuel gauge, I only pump out the stabilized storage fuel when preparing for a race.


Sensors drift. Do you verify that it hasn't drifted enough to matter periodically? I'd think a 2 or 3 point check once a year would be sufficient... Until you saw a change that mattered.

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#8
steveracer

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I've spot checked it here and there, it's within the margin of error of a fuel jug, which aren't really very accurate. I'd say it's within a pint.

 

Check the graduations on a jug against a fuel pump, you may be surprised...


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#9
Tom Hampton

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I've spot checked it here and there, it's within the margin of error of a fuel jug, which aren't really very accurate. I'd say it's within a pint.

Check the graduations on a jug against a fuel pump, you may be surprised...


Wouldn't surprise me at all. Especially pumps at the track which might not be calibrated very often or ever,

That's why I ignore the fuel pump. I just use the graduations on my fuel jugs. It's all relative to the jug which might be wildly wrong, but internally consistent as long as I use the same jugs.

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#10
steveracer

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The 5 mark is usually accurate, but check 2, 2.5, 3 next time you fill jugs at a retail pump.


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#11
steveracer

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So my method is easier, quicker, and just as accurate...


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