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11-04-2014, 03:37 PM | #1 |
Registered User
Join Date: Nov 2012
Location: Salt Lake City, UT
Posts: 520
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fuel delivery
My motor is a 2001 5.3 with the return line on the fuel rail at the manifold. Quick question, is it possible to have too large of a return line? Both my main line and return line are stainless braided 3/8" (-6an) line. My pressure at the rail is 47 psi at idle, is that normal? It has a new walbro 255 pump, new lines, new trick flow filter, new regulator.. the truck runs ok, but I haven't taken it out much.
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11-04-2014, 04:00 PM | #2 |
1965 Chevy C10, 2005 4.8L/4l60
Join Date: Aug 2004
Location: DFW Texas
Posts: 8,546
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Re: fuel delivery
no harm, as long as the lines are rated for fuel. if not, they could collapse.
47-50 is normal, should come up to about 58 when accelerating.
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11-04-2014, 06:01 PM | #3 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: fuel delivery
Nothing monitors the pressure or flow of the return line, it basically just pee's into the tank when it has extra fuel. As long as the fluid in the return line can make its way to the tank, your all good. I guess if you had a 1" pipe or something the pressure could be so low in the return that the fluid couldn't make its way all the way there...but thats insane in the first place.
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11-04-2014, 09:17 PM | #4 |
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Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: fuel delivery
47 seems anlittle low. What does it go to when you pull the vacuum hose off the regulator?
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11-06-2014, 09:55 PM | #5 |
Registered User
Join Date: Nov 2012
Location: Salt Lake City, UT
Posts: 520
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Re: fuel delivery
Thanks for replying guys. When I take the vacuum off the regulator it jumps up to 55 psi. I wish I had a way to watch it while driving.
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11-06-2014, 10:09 PM | #6 |
Registered User
Join Date: Nov 2012
Location: Salt Lake City, UT
Posts: 520
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Re: fuel delivery
Also, when I put it in drive and hold the brakes while pushing the gas, it'll go from 47 up to 55-56 psi. So I guess it's all good? I can't drive it yet because it needs new tires, but gassing it while breaking should simulate driving under a load, I would think.
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