Fuel system setup questions
#424222
07/30/09 06:42 PM
07/30/09 06:42 PM
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Joined: Jul 2003
Posts: 1,143
Imlay City, MI
DTT
OP
super gas
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OP
super gas
Joined: Jul 2003
Posts: 1,143
Imlay City, MI
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Im in the process of doing my fuel system in my pickup. Its a pro street style vehicle. Im running -8 line for my feed. I have a fuel cell with a sump. My questions are:
1) The cell I have has foam, can I pull it out and still perfrom well on the street? What are the advantages to running it in a mostly street driven vehicle?
2) My return, should it be one size smaller or bigger than my feed? I have heard reccomendations for doin it both ways.
3) I have seen a lot of vehicles that have the return and/or the vent lines coming out of the cell ran in a coil configuration. Whats the reasoning for this?
4) Does anyone make a reducer that is also a bulkhead? Meaning I can go from -6 to -8 but doing it in a bulkhead through my bed floor.
Thanks a lot. Any other help is appreciated.
1978 Pro Street D100
1936 Dodge truck (Hot rod)
1957 Plymouth Plaza
1962 Chrysler 300
1964 Dodge 440
1995 Jeep Grand Cherokee
1971 Big Block Demon (Dads)
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Re: Fuel system setup questions
[Re: DTT]
#424224
07/30/09 07:07 PM
07/30/09 07:07 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Foam is there to control slosh, you have a sump but dont have any baffles.... it MIGHT slosh enough to suck air in a low fuel condition. If you go with a larger return line(larger than the supply) you know you wont ever have a pressure build up in the return causing the regulator to act goofy. I'm not sure about the bulkhead fitting. The coil of line is for expansion in the tank, it will break a suction if one were to develop 
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Re: Fuel system setup questions
[Re: DTT]
#424227
07/30/09 11:17 PM
07/30/09 11:17 PM
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Joined: Feb 2003
Posts: 989
Rather be in Fallon, Nevada
RussW
super gas
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super gas
Joined: Feb 2003
Posts: 989
Rather be in Fallon, Nevada
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Quote:
Quote:
what pump and regulator?
Mallory 140 pump. Mallory return style regulator.
I'm using the same, I run # 8 feed to the carb and 3/8 steel return w no issues
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Re: Fuel system setup questions
[Re: RussW]
#424228
07/31/09 02:00 AM
07/31/09 02:00 AM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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You can get a -8 an female to -6 an male reducer and then screw it onto a bulkhead fitting. But I doubt you can get it as one fitting. And here is a second way that is more compact. In stead of a Bulkhead fitting you can screw the reducer onto a -8 Male X -8 Male fitting. But it has to be tight to make it seal. So you would have to adjust the clearance or tightness on the sheetmetal that is passes through by adding washers or sanding the bottom of the reducer fitting as I already have on this one. It would not hurt if the whole thing was slightly loose on the sheetmetal as long as you backed it with a wrench when you tightened other fittings/lines onto it. Which you should anyways.
Ron.
Last edited by dragrcr97; 07/31/09 02:42 AM.
SRT DEMON ONE SEAT
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Re: Fuel system setup questions
[Re: Ron Silva]
#424229
07/31/09 02:01 AM
07/31/09 02:01 AM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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the two fittings together
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Re: Fuel system setup questions
[Re: Cab_Burge]
#424233
07/31/09 05:42 PM
07/31/09 05:42 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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Quote:
Quote:
Quote:
what pump and regulator?
Mallory 140 pump. Mallory return style regulator.
I would call Mallory and ask them about using a return line on that pump, I don't think it has enough power to feed a good size motor at WOT and use a return style regulator   I hope I'm wrong  I have used that pump before on a stock stroke 440 with 906 heads and a single four barrel set up, 2 3/8 feed lines into two Fram fuel filters Y into the pump #8 line to the Mallory two port regulator they recommended, that set up was marginal on that combination
um, i'm over 700 hp and run a mal 140 and return style reg. -8an to and from with a stock tank and a 1/2 inch pickup. my fuel pressure is rock steady at over 130 mph
Gen 3 power 6.22@110, 9.85@135
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Re: Fuel system setup questions
[Re: sixpackgut]
#424234
07/31/09 08:31 PM
07/31/09 08:31 PM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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I have a return style regulator that is DOWNSTREAM of the carb and does not kill any of the flow going to the Carb. It is a BACKPRESSURE Regulator and may work for you.
SRT DEMON ONE SEAT
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Re: Fuel system setup questions
[Re: sixpackgut]
#424237
08/03/09 05:36 PM
08/03/09 05:36 PM
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Joined: Jul 2003
Posts: 1,143
Imlay City, MI
DTT
OP
super gas
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OP
super gas
Joined: Jul 2003
Posts: 1,143
Imlay City, MI
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Ive ran this setup for about a year without any real issues. I just decide to change my fuel cell and figured Id see if I should up the size of my return while Im at it along with any other changes....I am running a 3/8 return and 1/2 feed.... My regulator is the backpressure type too...
Should I up the size of my return to 1/2 (-8) as well???
and I still havent decided if Im going to remove the foam or not....... Thanks
1978 Pro Street D100
1936 Dodge truck (Hot rod)
1957 Plymouth Plaza
1962 Chrysler 300
1964 Dodge 440
1995 Jeep Grand Cherokee
1971 Big Block Demon (Dads)
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