Fuel pressure Reg issue

DynaSlim

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Ok, I just hooked up my mallory 140 pump with 1/2 line and 3/8 return coming off my regulator. The old setting on the reg before was getting about 5 psi. Now I'm getting 9 and with the reg backed all the way out i can only get the pressure down just below 8 psi.

Is this normal for a more powerful pump and bigger lines?

Any ideas for me to get the pressure down around 6 psi would make me happy.
 

daturbosix

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you need a larger return. to verify, take off return from regulatro, and empty into a bucket.. see if you can adjust it down then.
 

DynaSlim

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Ok. Thanks. This sucks. I was going to dead head the n20 pump with a reg. You think I'll be able to adjust it or will i be stuck at what ever the pump pushes?
 

DynaSlim

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The one with the return is the motor. I was going to deadhead the n2o pump but use a regulator with it.
 

DynaSlim

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Both on one tank but separate direct fittings. I see that the -6 is too small now. It was ok when i was using the stock lines. So i take it the return and sending lines must match in size?
 

daturbosix

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Not nessicarily. They just have to work. But usually matching the size is a good start
 

daturbosix

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I have done several a-1000 systems with 10 feed and 8 return. Motor and nitrious pulled off the same 10 feed
 

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