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rb25 fueling


dnatoli

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Im in the very slow process of getting an s2 rb25 into my 72 240. Very slow because of work and my BT audi slid into a pole and ive been recovering from that so I havent really been able to move in the ways required to work on cars. But anyway, I try and avoid posting threads because I usually just get some link to another page that only half answers my question or some attitude or being called a noob or something useless. When I do post these, I try and keep it really simple...

 

My question for all of you OG rb swap goers,

 

Would it be better to run my fuel return line into the surge tank or just simply create a spot on the factory gas tank to let the fuel run back into?

 

I am running the baffle-less tank with an inline summit low pressure fuel pump into a surge tank which is then pulled by a walbro up to the engine.

 

Thanks in advance,

 

Daniel

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run return back to surge tank. Reason being, if the high pressure walbro out-flows the low pressure pump, it could drain the surge tank defeating the purpose.

 

Though there also needs to be a return from the surge tank to the fuel tank as well...make sure this a decent size so the surge tank doesn't become pressurized.

 

Mark

Edited by mtnickel
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  • 2 weeks later...

I used the smaller of the two vent lines located on top of the tall portion of the tank for my return. This works, BUT you must make sure the larger vent line has NO kinks or you will build up pressure in the tank and in my case have a fuel volcano out the the filler. Es no bueno:(

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  • 2 weeks later...

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