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Home > Help Needed / General Tech Chat > fuel return theory.

turbochargedstu

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gateshead

if someone (ie me) had decided to put the fuel return line back into the fuel feed line instead of the tank, after the pump, what would it do to the regulator??

i realise its wrong and i am going to swap it to return to the tank, but would it cause a prob??

stu

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops


metroturbo

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North Yorkshire

You can put it to the pump suction without a problem. If you put it after the pump you will have no return flow at all as pump discharge pressure will be higher than return pressure.


Brett

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Doncaster, South Yorkshire

it will cause a problem the return has to go to a low pressure point on the fueling system

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Joe C

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Carlos Fandango

Burnham-on-Crouch, Essex

what will happen is you will over power the regulator and it will force its way into the carb,

could split the reg diaghram, easy enough to pull the top off and check though

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At the risk of being sigged...

Joe, do you have a photo of your tool?



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Sprocket

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Preston On The Brook

it wont split the regulator diaphragm since the pressure will be the same either side, since the pressure is the same either side of the diaphragm there is no regulation and the fuel pressure will rise to what ever the fuel pump can sustain, which will be considerably higher than the desired 3psi. high fuel pressures have been known to overcome the float valve in the carb and flood the engine, which is the initial problem being suffered by this engine.

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Is it A-Series only? I think it should be...
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wil_h

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Betwix Harrogate and York

You're both half right.

If connected as you describe, the full pump pressure will be seen at the carb, and fuel will squirt out of the jet; it's unlikely your car will run.

Also, it has the potential to damage the FPR. Fuel is only ever on one side of the diaphragm, the other side is boost pressure. So you will put it under full fuel pressure. However, it can potentially see very high pressure in normal operation, so it's not a big worry IMO.

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On 2nd Jan, 2013 fastcarl said:

the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

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I'm mainly concerned about swirl in the runners caused by the tangential entry.


robert

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uranus




On 6th Jan, 2013 Sprocket said:
it wont split the regulator diaphragm since the pressure will be the same either side, since the pressure is the same either side of the diaphragm there is no regulation and the fuel pressure will rise to what ever the fuel pump can sustain, which will be considerably higher than the desired 3psi. high fuel pressures have been known to overcome the float valve in the carb and flood the engine, which is the initial problem being suffered by this engine.



um ,colin, i may be drivelling here , but if there is 9 million psi fuel pressure on the underside of the diaphragm ,and engine manifold ref pressure on the uppper side ,how can the pressure be the same on both sides ?
have you connected the fuel return to the upper side of your regulator ? if so do you find the pressure a little high too ?*smiley*

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turbochargedstu

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gateshead

thought as much. will commence on re plumbing it all back in correctly. i fully expect the diaphragm to be fucked so will rip it apart and have a look. its amazing how something can just puzzle you for weeks, then all of a sudden, in the middle of asda, it comes to you! thank you everyone.

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops


stevieturbo

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Northern Ireland

I'd be more concerned about dumping litres of fuel into the engine !!!

Do not try and turn the engine over until you've removed the plugs and inspected for fuel.

And perhaps the plenum, boost pipes....drain the oil etc

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tadge44

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Buckinghamshire

And dont crank it over with the plugs out and the ignition on !

Thats how I set mine on fire !


mercenary62

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somewhereintheuniverse near selkirk scotland

you wont know until you put it back together correctly mate, but as above remove the plugs , dont crank it over with a live supply to the plugs

give em hell


turbochargedstu

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gateshead

ha ha. too late, already did that last week! it wasnt spewing fuel in massive amounts into the engine though. not enough to spray out of the plug hole anyway! it did fire up, but then cut out after a couple of seconds.

balls to the blower!!!



1330,stage3 head, gt1549, canems ecu, S/C box and drops

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