When do I need bigger fuel lines? - Page 4 - TurboDodge.Com - Turbo Dodge forum for Turbo Mopars, Shelbys, Daytona, SRT-4, PT Cruiser, Omni and more!

Ondonti · 09-28-2005, 06:18 PM

Quote:

Originally Posted by Putter

I converted my Omni from carb to turbo, it was equipped with 5/16" lines when carbed.

I believe this was in the early 80's

Putter · 09-28-2005, 06:55 PM

The car is an 87, I think there was a mid model switch from carbed to TBI in 87....but don't quote me on that.

Dean Stillie · 10-23-2005, 10:22 AM

Quote:

Originally Posted by kedavis

You can flow enough fuel through a 5/16 line at 40 psi to support over 450 hp.

I agree ! I ran 40 psi in my 2.5 8v with 5/16ths fuel line to the tune of 10.84@127 the car then was about 2250lbs

igotaneed4speed · 10-23-2005, 08:28 PM

aeromotvie suggested that i run a #6 return line with my set up its a a-1000 pump and reg... and it uses #10 feed lines from the sump to the pump and then is #8lines from the pump outlet to the reg\rail...

i dont see why they would suggest that if it could cause a climbing pressure issue at low fuel usage...

turbo minivan · 02-15-2006, 02:17 PM

if the performance 255 pump is putting out "255 pph", what is the stock pump putting out? what if one were to splice 2 pumps together in stead of using a 255?

turbovanman · 02-15-2006, 03:14 PM

Quote:

Originally Posted by turbo minivan

if the performance 255 pump is putting out "255 pph", what is the stock pump putting out? what if one were to splice 2 pumps together in stead of using a 255?

255 is the rating of L P H or Liters Per Hour, not PPH. The stocker is around 170 LPH.

Yes, you can splice two pumps together, it has been done but for the price and hassle, I personally feel its not worth it, just drop in the 255 and be done with it.

turbo minivan · 02-15-2006, 04:20 PM

call me adventurouse then.(spelling?) so doing 2 pumps, could i splice them together and use the 1 stock set of fuel lines? or will they be too small and restrictive for the new volume and pressure? im thinking of running a second set of lines and splicing them together under the hood at the rail. comments?

puppet · 02-15-2006, 04:33 PM

Quote:

Originally Posted by turbo minivan

call me adventurouse then.(spelling?) so doing 2 pumps, could i splice them together and use the 1 stock set of fuel lines? or will they be too small and restrictive for the new volume and pressure? im thinking of running a second set of lines and splicing them together under the hood at the rail. comments?

While you can do this you have to remember that your pushing through another pump. That has to mess up the flow and probably the pressure. The only time I've heard of this is in the event of a pump failure ... the second kicks in. .... not to increase flow or pressure.

turbovanman · 02-15-2006, 07:05 PM

Quote:

Originally Posted by puppet

While you can do this you have to remember that your pushing through another pump. That has to mess up the flow and probably the pressure. The only time I've heard of this is in the event of a pump failure ... the second kicks in. .... not to increase flow or pressure.

Ford used to do this on there pickups, an intank pusher pump as electric pumps push better than pull, and then a higher pressure pump inline. Bosch mechanical and semi-mechanical fuel injection also has the same setup, but if the intank pumps fails, they won't run.

Putter · 02-15-2006, 10:18 PM

Ford uses dual pumps in the Cobra Mustangs. They run them in parallel and only turn the second one on under boost. They are factory twin 195l/hr, many people replace them with dual 255 l/hr when they run out of fuel.

turbo minivan · 02-18-2006, 06:29 PM

Quote:

Originally Posted by puppet

While you can do this you have to remember that your pushing through another pump. That has to mess up the flow and probably the pressure. The only time I've heard of this is in the event of a pump failure ... the second kicks in. .... not to increase flow or pressure.

im not talking about putting another in ine with the origional, im talking about removing the fuel gauge sender unit from the tank and in its place installing a second pump (from a 95 van to be specific, its a pump and gauge sender in 1 unit unlike the 89s seperate units, this way i still have a fuel gauge) then i can either run a second set of fuel lines and Y them at the rail, or get a bigger set of lines and Y the pumps at the tank.

puppet · 02-18-2006, 09:39 PM

Quote:

Originally Posted by turbo minivan

im not talking about putting another in ine with the origional, im talking about removing the fuel gauge sender unit from the tank and in its place installing a second pump (from a 95 van to be specific, its a pump and gauge sender in 1 unit unlike the 89s seperate units, this way i still have a fuel gauge) then i can either run a second set of fuel lines and Y them at the rail, or get a bigger set of lines and Y the pumps at the tank.

OK ... but what are you trying to accomplish?

Heavytank2 · 02-18-2006, 10:05 PM

... provide more fuel.

Two pumps are better then one. Combined output should be pretty high, but you are doubling your chances of failure. In a normal setup if the pump were to blow you'd coast to the side of the road. In a twin if one blows you could halve your pressure... and your fuel... bad news.

turbo minivan · 02-20-2006, 01:35 AM

in the case of one failing, the pressure and fuel supply shouldnt go bad (unless racing) cause if one shut down, it would basicly go back to stock, with one pump. right? maby not? they will be running on 2 sets of stock supply and return lines and be Y'd at the rail, so basicly 2 totaly seperate units working together. i dont know, maby not? what do people think of this?

turbovanman · 02-20-2006, 01:58 AM

Quote:

Originally Posted by turbo minivan

in the case of one failing, the pressure and fuel supply shouldnt go bad (unless racing) cause if one shut down, it would basicly go back to stock, with one pump. right? maby not? they will be running on 2 sets of stock supply and return lines and be Y'd at the rail, so basicly 2 totaly seperate units working together. i dont know, maby not? what do people think of this?

A hell alot of work for absolutely no reason.