FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator"
01-29-2003, 05:31 PM
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FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" It's in the description of a fuel pump I am looking at. Is that a special kind of regulator? I have the Speed Inc adjustable fuel pressure regulator. Does that work? Thanks.
01-29-2003, 06:17 PM
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Re: FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" Two types of regulators are out there -
"buck", and "bypass".
The "buck" style works by restricting flow
through it. It presumes / requires a minimum
flow to work (otherwise, a little leakage
through the regulator could still build
pressure.
The bypass regulator works, instead, by
releasing any fuel not needed to make the
pressure into an alternate line (the return).
The bypass regulator need not create any
restriction in the line, and this is more
efficient at high flows.
Earlier models had the regulator up front
and a return line back to the tank. From
what I read, the later ('99-up?) have the
regulator mounted on the in-tank pump. So
all return is local.
If you run the (unregulated) pump in line after
your present pump system, and there's no bypass
reg / return line to the tank, it will pump
to the limit of its abilities, resulting in
an unregulated fuel pressure up front. Bad.
Having the regulator at the front end of the
injector rails is the best, it can null out
all of the variables and give you the most
consistent pressure (hence most consistent
performance). But best isn't cheapest....
"buck", and "bypass".
The "buck" style works by restricting flow
through it. It presumes / requires a minimum
flow to work (otherwise, a little leakage
through the regulator could still build
pressure.
The bypass regulator works, instead, by
releasing any fuel not needed to make the
pressure into an alternate line (the return).
The bypass regulator need not create any
restriction in the line, and this is more
efficient at high flows.
Earlier models had the regulator up front
and a return line back to the tank. From
what I read, the later ('99-up?) have the
regulator mounted on the in-tank pump. So
all return is local.
If you run the (unregulated) pump in line after
your present pump system, and there's no bypass
reg / return line to the tank, it will pump
to the limit of its abilities, resulting in
an unregulated fuel pressure up front. Bad.
Having the regulator at the front end of the
injector rails is the best, it can null out
all of the variables and give you the most
consistent pressure (hence most consistent
performance). But best isn't cheapest....
01-29-2003, 06:32 PM
#3
Re: FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" thats sorta what i think is correct, lemme see if i can clarify
'buck' regulates fuel before it gets to the rails
like this (fuel flowing)
tank--->pump------>regulator-->rails->end
'return' regulates the amount of fuel going back to the tank after the rails
like this tank--->pump------->rails---->regulator-->tank
buck style will cause a fuel pressure drop on a quick stab of the throttle, and return style will not (as much)
buck style also puts a lot of strain on the fuel pump.. this is the part you are concerned about.
all ls1 years are all return style, meaning the regulator is bleeding fuel pressure off of the rails and dumping exess back to the tank.
beeler, long as you have a return line going back to the tank, you have a 'return' setup. so you are good.
'buck' regulates fuel before it gets to the rails
like this (fuel flowing)
tank--->pump------>regulator-->rails->end
'return' regulates the amount of fuel going back to the tank after the rails
like this tank--->pump------->rails---->regulator-->tank
buck style will cause a fuel pressure drop on a quick stab of the throttle, and return style will not (as much)
buck style also puts a lot of strain on the fuel pump.. this is the part you are concerned about.
all ls1 years are all return style, meaning the regulator is bleeding fuel pressure off of the rails and dumping exess back to the tank.
beeler, long as you have a return line going back to the tank, you have a 'return' setup. so you are good.
01-29-2003, 09:38 PM
#4
Re: FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" all the above is true, but they might be saying that its simply not a pump for a returnless system (like the new stangs, where the computer controls the voltage, to keep the fuel pressure where it needs to be)
Ryan.
Ryan.
01-31-2003, 03:07 PM
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Re: FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" the answer is in the question what they are saying is the return back to the tank does not go through the regulator first
01-31-2003, 07:58 PM
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Re: FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" Pony killer, To me it sounds like they are saying the return line does go thru the regulator first. </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> like this tank--->pump------->rails---->regulator-->tank </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
02-02-2003, 01:13 AM
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Re: FUEL PUMP --- What does this mean "must be run with a bypass/return style regulator" you are correct it just does not regulate what goes back to the tank hince bypass thats all it means
