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3888 Posts in 1208 Topics- by 2248 Members - Latest Member: jaydeb1949

May 24, 2012, 02:31:29 AM
General CategoryThe Driver's Loungefuel line pressure
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Author Topic: fuel line pressure  (Read 1129 times)
craigbean
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Posts: 25
« on: March 28, 2009, 03:50:07 PM »
I have a '74 TR6 with a mechanical fuel pump. I want to check the filter, but when I loosen the top nut, gas flows out. I don't want to wait around to see how much comes out and risk a fire, so I wonder if the gas that's coming out is just the residual amount that's already in the pump or is the fuel under pressure even when the car is off?
Do I need to clamp the fuel line before opening the pump to clean the screen inside?

Thanks - Craig
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gusc
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Posts: 17
« Reply #1 on: April 30, 2009, 12:48:34 AM »
Craig,

I know this is really late but I just started on the forum.

If your filter is down low near the fuel pump the pressure is from the tank head and you need to clamp the hose.

If your filter is up high near the carbs like on my TR4 the seepage is from residual pressure and will stop after it dribbles a  bit.

I keep a set of cheap sharp nose vise grips with the jaws covered by rubber tubing in the glove compartment for this purpose.
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Gus Causbie
'63 TR4, s/n CT10059L
Ash Flat, AR
charley fitch
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Posts: 340
« Reply #2 on: April 30, 2009, 01:05:19 AM »
Gus has answered the question abot the residual pressure.  However, what does happen also is that the fuel pump  and bowl on the TR3&4 is lower than the fuel tank.  Therefore whenever you are doing anything with the pump you will get gravity flow from the tank.  The early TR3 had a shut off on the line.  I understand that they were unreliable and were later eliminated.  A friend has found a great fix for this situation.  We use a very small in line shut off switch for a motorcycle.  I have it on two of my cars and nobody but the most attentive ever sees it.
Charley Fitch  Cool
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gusc
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Posts: 17
« Reply #3 on: April 30, 2009, 10:28:16 PM »
Charley,

I'm going to add a valve before the bowl also, it is really a nuisance having to clamp off that hose.

I"m assuming any brass valve made for tubing will work ok.
« Last Edit: April 30, 2009, 10:30:01 PM by gusc » Logged
Gus Causbie
'63 TR4, s/n CT10059L
Ash Flat, AR
charley fitch
Sr. Member
****
Posts: 340
« Reply #4 on: May 01, 2009, 01:45:09 AM »
The one that we found is plastic and I put it on the rubber tubing prior to the metal tubing going to the fuel bowl.  I did use two hose clamps and put it on there.
Could not be easier.
Charley Cool
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gusc
Newbie
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Posts: 17
« Reply #5 on: May 01, 2009, 11:53:36 PM »
The one I had in mind connects to the metal tubing but your idea is better.
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Gus Causbie
'63 TR4, s/n CT10059L
Ash Flat, AR
craigbean
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Posts: 25
« Reply #6 on: May 04, 2009, 02:33:52 AM »
Thanks for the feedback, that's a good idea.

- Craig
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