Re: Needing help picking out fuel lines for my Fi Set up
[Re: turbobitt]
#2960291
09/02/21 12:43 PM
09/02/21 12:43 PM
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Joined: Feb 2010
Posts: 270 Mountain View, CA
68rrunner
enthusiast
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enthusiast
Joined: Feb 2010
Posts: 270
Mountain View, CA
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I used the factory style hard line, Hemi sized 3/8 supply and bought a regular BB/SB 5/16 line for the return and ran them side by side. I flared the factory line with the GM push-on style o-ring fittings and bought the appropriate adapters. For example Russell Performance 644133. AG. General rule of thumb is that the return line should be no less than the diameter of the feed line.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: 68rrunner]
#2960298
09/02/21 01:20 PM
09/02/21 01:20 PM
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Joined: Aug 2011
Posts: 2,904 Pattison Texas
CSK
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master
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Posts: 2,904
Pattison Texas
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I used the factory style hard line, Hemi sized 3/8 supply and bought a regular BB/SB 5/16 line for the return and ran them side by side. I flared the factory line with the GM push-on style o-ring fittings and bought the appropriate adapters. For example Russell Performance 644133. AG. General rule of thumb is that the return line should be no less than the diameter of the feed line. I agree100% !!!!! but others will say you can use 1/4 in return
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: CSK]
#2960300
09/02/21 01:27 PM
09/02/21 01:27 PM
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Joined: May 2019
Posts: 722 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 722
Lake Villa Il
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I used the factory style hard line, Hemi sized 3/8 supply and bought a regular BB/SB 5/16 line for the return and ran them side by side. I flared the factory line with the GM push-on style o-ring fittings and bought the appropriate adapters. For example Russell Performance 644133. AG. General rule of thumb is that the return line should be no less than the diameter of the feed line. I agree100% !!!!! but others will say you can use 1/4 in return Yes I guess that would be me Used a 1/4 return on a twin turbo 70 malibu with a 255lph walbro pump for years. I think the general rule of thumb applies more to carburetor setups that are trying to regulate down to 6psi. Hasn't been an issue for me with efi pressures.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: INTMD8]
#2960438
09/02/21 08:52 PM
09/02/21 08:52 PM
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Joined: Aug 2005
Posts: 774 Southington Ct.
turbobitt
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super stock
Joined: Aug 2005
Posts: 774
Southington Ct.
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On EFI applications the return fuel is under little to no pressure compared to the supply so it can tolerate a smaller line. I wouldn't push my luck though on a 1/4" line though.
EDIT - Also, with some EFI setups you can PWM control the pump so you may have very little return flow so that makes running a smaller line way more feasible. AG.
Last edited by turbobitt; 09/02/21 08:54 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: 70RT Charger]
#2960493
09/03/21 12:17 AM
09/03/21 12:17 AM
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Joined: Jan 2003
Posts: 31,201 Oregon
AndyF
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I Win
Joined: Jan 2003
Posts: 31,201
Oregon
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Rich recommended a 3/8 return line but now I’m trying to figure out if I can use my Rev N Nator or not. Rich says he’s never even heard of one lol. I bought the hyperspark distributor. He said I should be good using my firecore wires and coil. Does it have a points in connection? When the Sniper controls the timing the control works thru the white wire which connects to the points in connection on the ignition box. MSD and Holley ignition boxes have spot to connect the points output. If you have that on your box then you are good to go. Either look at the box or look at the instructions.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: turbobitt]
#2960494
09/03/21 12:20 AM
09/03/21 12:20 AM
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Joined: Jan 2003
Posts: 31,201 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
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Oregon
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On EFI applications the return fuel is under little to no pressure compared to the supply so it can tolerate a smaller line. I wouldn't push my luck though on a 1/4" line though.
EDIT - Also, with some EFI setups you can PWM control the pump so you may have very little return flow so that makes running a smaller line way more feasible. AG. Correct. If the EFI pump is sized correctly then the return line should not have much pressure in it so it can be smaller. All the EFI cars that I've plumbed lately have used a regulator in the trunk (race cars) or the regulator is in the tank (street cars) so I don't use a return line anymore. The OEM guys don't use return lines.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: AndyF]
#2960511
09/03/21 04:05 AM
09/03/21 04:05 AM
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Joined: Jul 2007
Posts: 732 eastern,Ky
70RT Charger
OP
super stock
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OP
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Joined: Jul 2007
Posts: 732
eastern,Ky
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Rich recommended a 3/8 return line but now I’m trying to figure out if I can use my Rev N Nator or not. Rich says he’s never even heard of one lol. I bought the hyperspark distributor. He said I should be good using my firecore wires and coil. Does it have a points in connection? When the Sniper controls the timing the control works thru the white wire which connects to the points in connection on the ignition box. MSD and Holley ignition boxes have spot to connect the points output. If you have that on your box then you are good to go. Either look at the box or look at the instructions. The Rev N Nator uses a factory style box and plug in just like original with the ballistor. If my box won’t work can I do away with the Ballistor and just use MSD 6 Al and which model number 6al do I get and matching coil or The Holley ignition Box with Firecore coil?. What ignition set up do you recommend as I couldn’t get a clear answer from Rich. He must be a busy man and didn’t reply to my last email. I just need to get this stuff ordered. Thanks!!!
Last edited by 70RT Charger; 09/03/21 04:39 AM.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: 70RT Charger]
#2960527
09/03/21 07:24 AM
09/03/21 07:24 AM
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Joined: Jan 2003
Posts: 8,222 Plymouth, MI
Blusmbl
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master
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Posts: 8,222
Plymouth, MI
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The Rev N Nator is a replacement MP style ECU that requires the magnetic pickup distributor to work, the Holley won't be able to control it unfortunately if you're looking to control timing from the Holley. I'm researching this stuff myself, I already have a 6AL and Blaster II coil, was going to use the points output from the Holley to drive the MSD box. If I were you since you need to replace everything and already bought the Hyperspark distributor, I'd buy the matching Hyperspark CDI box and coil. You won't have a ballast resistor in line with the 12v feed to the coil anymore. https://www.holley.com/products/fue...er_efi/hyperspark_ignition/parts/556-151https://www.holley.com/products/fue...er_efi/hyperspark_ignition/parts/556-152
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: turbobitt]
#2960539
09/03/21 08:37 AM
09/03/21 08:37 AM
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Joined: Oct 2007
Posts: 4,219 New York
polyspheric
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master
Joined: Oct 2007
Posts: 4,219
New York
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under little to no pressure compared to the supply so it can tolerate a smaller line
Backward. Low pressure requires a larger line (like voltage vs. gauge size). The reason the smaller line works is low volume, not low pressure.
Boffin Emeritus
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: AndyF]
#2960605
09/03/21 11:45 AM
09/03/21 11:45 AM
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Joined: Feb 2010
Posts: 270 Mountain View, CA
68rrunner
enthusiast
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enthusiast
Joined: Feb 2010
Posts: 270
Mountain View, CA
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On EFI applications the return fuel is under little to no pressure compared to the supply so it can tolerate a smaller line. I wouldn't push my luck though on a 1/4" line though.
EDIT - Also, with some EFI setups you can PWM control the pump so you may have very little return flow so that makes running a smaller line way more feasible. AG. Correct. If the EFI pump is sized correctly then the return line should not have much pressure in it so it can be smaller. All the EFI cars that I've plumbed lately have used a regulator in the trunk (race cars) or the regulator is in the tank (street cars) so I don't use a return line anymore. The OEM guys don't use return lines. [Isn't this also because all the OEM's are PWM now as well? If you're not running a PWM pump and no return from the rail/forward regulator, sounds like a recipe for short pump life.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: AndyF]
#2960683
09/03/21 03:09 PM
09/03/21 03:09 PM
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Joined: Jul 2007
Posts: 732 eastern,Ky
70RT Charger
OP
super stock
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OP
super stock
Joined: Jul 2007
Posts: 732
eastern,Ky
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I agree with that. If you already have MSD stuff then keep it but if you're buying new then I'd go with the Holley Hyperspark ignition box. The MSD boxes cost more because they have extra features such as rev limiter chips but you don't need any of that stuff when you are using the Sniper since it is all built in. Ok I’ll buy the Holley stuff. Any recommendations for spark plugs with this set up and I’m done with this thread. Thanks to everyone for the help.
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: AndyF]
#2960714
09/03/21 04:08 PM
09/03/21 04:08 PM
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Joined: Jul 2007
Posts: 732 eastern,Ky
70RT Charger
OP
super stock
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OP
super stock
Joined: Jul 2007
Posts: 732
eastern,Ky
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Plugs depend on which head you have and what the compression ratio is. I use NGK 6987 on all my street builds but I also always use a Trick Flow head. I haven't used a cast iron head for more than 30 years so no idea what plug would work with them. Im running the Trick Flow 240. Thanks again!!!
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Re: Needing help picking out fuel lines for my Fi Set up
[Re: AndyF]
#2960734
09/03/21 06:07 PM
09/03/21 06:07 PM
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Joined: Jul 2007
Posts: 732 eastern,Ky
70RT Charger
OP
super stock
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OP
super stock
Joined: Jul 2007
Posts: 732
eastern,Ky
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Then the 6987 should work for you. Those are a wide gap, extra projected nose plug. They are OEM fitment on several newer cars and are usually around $3 each from Summit or NGK direct. That’s great, thanks again!
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