Howdy all,

I bought a BBK High pressure fuel pump for my Jeep 5.0 conversion.
The pump is installed and high pressure lines are running from the "Out" side of the pump forward all the way to the motor.
HOWEVER currently I have normal fuel lines running from the tank (19" or so) to the "IN" side of the pump.

MY question is this, do I need to have high pressure lines from the tank to the pump or can I use "regular" fuel lines there.

I'm sure the best thing to do is just put the Freakin high pressure lines in and be done with it, However getting to the top of my fuel tank right now is quite a task and I am curious to know if high pressure lines in this "Low pressure" area of lines is a "MUST"

It seems to me the lines before the pump will be pulling in fuel from the tank (No pressure) then once passing through the pump itself will end up in the high pressure lines.

SO the way I see it (Please correct me if I am wrong here I don't want to have any surprises with the fuel lines!!) follows;

Tank > Pump = Low pressure
Pump > Engine = High Pressure

So my question is Do I need to make all the lines High pressure or can I run it in it's current configuration.


Mark

The feed line from the tank to the pump will not have any pressure in it. In reality, it will have a slight vacuum (suction) in it.

cmk

If by 'regular' you mean the stock hard lines in your rig, then yes--those will work fine. I plumbed mine in when swapping in my EFI engine and it worked great.

However, if you mean plain rubber hoses and worm-drive hose clamps, I wouldn't risk it. You MIGHT be able to get away with it on the return line like you say, but if it were my Jeep, I'd want the peace of mind that comes with running high pressure lines throughout.

After re-reading your post, it looks like you could be talking about the hose from the tank to the pump... Again, you MIGHT get away with it, but I'd be worried about the hose getting 'sucked shut' at a bend or something. That could either inhibit flow (hard on your pump and would cost you lots of pressure at the fuel rail) or (possibly) stop flow completely.

When I plumbed the Ramjet, I used hydraulic hoses and fittings throughout my entire fuel system (except for the hardlines running from the front to the back of the Jeep). It might be overkill, but I look at it as one less thing I have to worry about.

My $.02 USD,
Jake

Sounds like sound advise guys, thanks!

I think I'm gonna be replacing it.

Great, how fun.

;)



Mark

I have seen some bling bling race electric pumps collapse rubber lines used on the suction side, so I'd try to use as much hard line as you can, which you should anyway, most race classes only allow a maximum of 18" total rubber fuel line on the vehicle.

On a similar note, one of my buddies installed a fancy schmancy electric fuel pump on his Chevy pickup because it's 454 was running out of fuel at the top end of the 1/4 mile (who builds a truck on 35's to go out and race anyway) and couldn't figrue out why it wouldn't run worth a shit afterwards. He bought a fuel pressure regulator, he replaced the pump, he replaced lines, he shrouded the pump from heat, he even moved the pump at least three times. Everybody asked him if he had the pump installed right, everytime he said yes. Finally, after several weeks of the truck idling somewhat okay, but faltering and stalling everytime he hit the gas, we were all talking about his problem when one last person asked if he had it going the right direction, and in a frustrated rage he said.....

"Yes it's fawking in there right!" as he pointed to it up on the hoist "See! OUT of the fawking tank and IN to the fawking motor!"

A dead silence came over the shop, followed shortly by bellowing laughter to the point of tears. He will never live that down.

Originally posted by Jakesteramalamajama
When I plumbed the Ramjet, I used hydraulic hoses and fittings throughout my entire fuel system (except for the hardlines running from the front to the back of the Jeep). It might be overkill, but I look at it as one less thing I have to worry about.

Jake, how will these hose hole up over time? Won't the Gas damage teh Hydro line?

Where do u get High pressure fuel line? I need both rubber and hard but I can't find it anywhere.

Originally posted by Bgcj5
Where do u get High pressure fuel line? I need both rubber and hard but I can't find it anywhere.

Any hard line will be fine, and any decent auto parts store will have the HP rubber lines. Just ask for fuel injection hose. The clamps are different for the HP hose also.

I asked the same question about the suction side to an EFI joint, and they said to use FI hose for that side, too.

HP hose is NOT SS braided! I do, however, use SS braided on my return line. (And HP hose for the supply)

Bryan

Originally posted by Mr.N
Jake, how will these hose hole up over time? Won't the Gas damage teh Hydro line?

No. It's basically nylon-reinforced rubber just like standard fuel line. Just with a lot more reinforcement (and some steel mesh reinforcement as well). Most hydaulic fluids are more caustic than gasoline anyhow.

I got my High Pressure Fuel lines at "B & B" here in Redmond, Wa.

It was like $2. a foot. Unfortunately I bought the last hose they had so now I will need to track down some more to complete my fuel supply line.

BTW I am using my stock 20 gal gas tank in my Scrambler to fuel my 5.0.
Stock return lines and vent line.

I can't wait to get this shit running!!!