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Index > Engine/Drivetrain > Thread: Fuel Return Lines
Thread: Fuel Return Lines
rotarynews


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Posts: 206
posted December 16, 2002 09:14 AM

Fuel Return Lines

Things are comming together really well. This truck is F-A-S-T. 55 in 2nd comes in at no time. 3rd is just scarry. 10 lbs of boost.. weee!

However, there is a remaining problem. I think it has to do with the return lines, or the fuel tank developing a vacuum. After about 15minutes of driving, the truck sputters, and dies at 1 lb of boost, but comes back to life when I let off the gas.

Does the return line have a regulator anywhere? It got dark too soon yesterday for me to crawl under the truck and poke around. Or, is it developing some sort of vacuum? or pressure that the pump can't overcome.


I have a Walbro 255 liter per hour In-line Fuel Pump,upgraded all the to-engine fuel lines with FI hose, but didn't do anything to the return lines, since that's not under pressure.



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wankel_dreams


Redlining
Posts: 293
posted December 16, 2002 05:22 PM

quote:

Does the return line have a regulator anywhere? It got dark too soon yesterday for me to crawl under the truck and poke around. Or, is it developing some sort of vacuum? or pressure that the pump can't overcome.



i have the exact same problem. mine is because fuel tank vacuum is overcoming the pumps ability. When i refurbished my fuel tank and ran new fuel lines, I removed all the "extra" stuff. Now my fuel system is air-tight and creates a vacuum as fuel is accepted by the carb. I'd guessyou are having the same problem. I'm just going to put a breather in the system to releive pressure and vacuum. I'm going to put it on the filler neck, where a capped a small line that should be easy to access without dropping the tank again.
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77 REPU
79 rx7
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wankel_dreams


Redlining
Posts: 293
posted December 16, 2002 05:24 PM

oh and yes, there was a flow restrictor in the fuel return line of my '77
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74 wankel panther
77 REPU
79 rx7
89 Vert

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