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#1
10-10-2012, 09:49 AM
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400/tri-pwr
Hi guys, I have a 400 ci that I want to put a tri-pwr on.My question is reguarding the fuel pump and lines.I have a single line 5/16 to the sending unit,should I change to a double line(return line), or will the single line be ok.The motor is basically stock.Thanks,Tim.
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#2
10-10-2012, 11:17 AM
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Only A/C vehicles pre-67 used return line.
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#3
10-10-2012, 12:46 PM
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But I think that the years the had the tripower had 3/8 line fron the sending unit to the pump. 5/16 may work unless you really plan to race it.
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#4
10-10-2012, 01:32 PM
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All A-body Pontiacs had 5/16" line from the sender, including Tri-Power, through 1967. 1968 and later had 3/8" line.
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#5
10-10-2012, 03:53 PM
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Tri-power setups use aluminum lines and my experience is that it is good to have a return after the pump with a 0.030" orifice to bleed off some pressure to keep from boiling the lines when you shut the engine down. My tripower use to get really wet on the clusters when I shut things down. I went to a return deal and that problem went away.
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Skinned knuckles and empty wallet! Could I be any happier? 66 GTO Convertible. LS3-525 HP. Legend LGT700 5-speed, Wilwood 4-wheel disc brakes, Ridetech coil over front susp, PMT rear susp, Hotchkis bars, Billet Specialties 18" Dagger's (18X9 rear, 18X8 front). 2002 Ram Air WS.6 convertible Trans Am. Wife's car. |
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#6
10-10-2012, 03:54 PM
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400/tri-pwr
I wonder why they changed it in 68?My motor is a 68 or 69 but I have a 66 lemans.What to do? Thanks guys,Tim.I think I'll go with the return line.
Last edited by Tim66; 10-10-2012 at 03:58 PM. Reason: add on |
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#7
10-10-2012, 04:19 PM
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return line?
Quote:
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#8
10-10-2012, 05:05 PM
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400/tri-pwr
No, the sending unit is w/o the return,but I have a new gas tank,so now i'll have to change the fuel pump, sending unit and add a extra line.It sounds like thats the best way to go.Tim.
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