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Erratic Fuel Pressure. 

 

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 Post subject: Erratic Fuel Pressure.
Posted: Sun Aug 01, 2010 3:27 pm 
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Age: 48

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Joined: 11th Jun 2010

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Ride: XK Falcon

Location: Rockhampton
QLD, Australia

Gday guys.Well i got the XK pre-crossflow 6 with blowthrough carb started but ive run in to a problem. Its running a VL turbo fuel pump to the Barry Grant 575 carb and a Barry Grant fuel regulator with return to tank.My problem is right from when i turn the pump on,before i start the engine the fuel pressure jumps up and down non stop.Any idea's greatly appreciated.
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 Post subject: Re: Erratic Fuel Pressure.
Posted: Sun Aug 01, 2010 8:20 pm 
Getting Side Ways
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Age: 34

Posts: 3406

Joined: 7th Feb 2005

Ride: AU2 Ute

Location: melbourne
VIC, Australia

Arent you supposed to run a low pressure pump with a carby?

Im not sure what the go is with boost and carby's but usually you need a low pressure pump to feed into carb. The VL one is high pressure. The reg probably cant bypass enough fuel.
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 Post subject: Re: Erratic Fuel Pressure.
Posted: Tue Aug 03, 2010 9:26 pm 
Getting Side Ways
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Age: 27

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Joined: 4th Apr 2010

Ride: AU falcon

Location: toongabbie
VIC, Australia

is the carby a proper blow through carby or are you using a normal style carb?

because if your using a normal one the fuel will blow back from the boost causing silly fuel pressure.

fuel for thought.

 

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 Post subject: Re: Erratic Fuel Pressure.
Posted: Thu Aug 05, 2010 3:22 pm 
Getting Side Ways
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Power: 482 rwkw

Location: Penrith
NSW, Australia

I assume you are using high pressure fuel reg to a low pressure [8Lb]boost referenced fuel reg ??
So boost doesn't push fuel back through carb ??
You'll need to replace the fuel floats with solid foam etc or they will deform on boost..
Check my second fav tech forum http://www.theturboforums.com/smf/index.php?board=13.0

 

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