Horsepower per fuel line

[farmo83]

How much horsepower will 3/8 fuel line support? IE at what point should I start going thinking about going to 1/2 inch?

 

[wsuwrhr]

If you aren't sure.....you should already have at least 1/2 fuel line.

 

[02HoWaRd26]

As per BoostPower even the 496ho should be fed by 1/2” so.....

 

[SBMech]

Funny. All those exotic 1000HP + vehicles that are running 280MPH+ don't need 1/2" fuel lines...

Dragsters? Yea...volume makes up for a lot.

 

[wsuwrhr]

Funny. All those exotic 1000HP + vehicles that are running 280MPH+ don't need 1/2" fuel lines...

Dragsters? Yea...volume makes up for a lot.

yooor kiddin right? usually plumbed with -8 min to -10 hoses

 

[AzGeo]

Pushing or pulling ?

 

[Lavey 29]

As per BoostPower even the 496ho should be fed by 1/2” so.....

Not going to disagree about the sizing fuel lines as bigger ID is better in most all cases - but in the stock Mercruiser apps there is many corks in the fuel side of the engine. On the 496 for instance - 2006 and up with the gen 3 cool fuel the exit fuel line ID coming out of the back side of the cool fuel is tiny as hell. It is smaller than 3/8 - the metal portion side of that fuel line.

 

[02HoWaRd26]

Not going to disagree about the sizing fuel lines as bigger ID is better in most all cases - but in the stock Mercruiser apps there is many corks in the fuel side of the engine. On the 496 for instance - 2006 and up with the gen 3 cool fuel the exit fuel line ID coming out of the back side of the cool fuel is tiny as hell. It is smaller than 3/8 - the metal portion side of that fuel line.

Believe their whole point was the feed lines to that, as a major issue with the 496 is lean conditions so his point was to keep the cool fuel section never in a chance to starve.

 

[02HoWaRd26]

yooor kiddin right? usually plumbed with -8 min to -10 hoses

My LS based 550hp motor is fed by all -10 also right up to the fuel rail where it runs through it as a -8 and the return as well is -8

 

[SBMech]

yooor kiddin right? usually plumbed with -8 min to -10 hoses

Direct Injection Rails run at around 2400 PSI, you don't need big lines if you run enough pressure.

 

[AzGeo]

Direct Injection Rails run at around 2400 PSI, you don't need big lines if you run enough pressure.

AND VOLUME ......

 

[Lavey 29]

the new stock marine Direct injection engines run at 2200 to 2250 fuel pressure -- the high pressure fuel pump under the intake manifold. Volvo for instance has the external Carter cool fuel cell with a low pressure fuel pump at around 8 psi and the high pressure fuel pump at around 60 to 70 psi to feed the main direct injection fuel pump under the intake manifold . Most of the rubber fuel lines are 3/8 out from the gas tank.

The Volvo 496 most of them are 3/8 rubber fuel line from the gas tank. Just saying.

If you you were to pull out the stock pick up tubes from the gas tanks - most are only 3 / 8 diameter for the stock marine production side of the coin. With that said as the cork in the system so really what good is using 1/2 inch rubber fuel line when the pick up tube is 3/8. I would change the fuel pick up tube and the rubber fuel to 1/2.