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| Allante or Cadillac 4.9 adjustable fuel pressure regulator? (Page 1/2) |
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Johns 4.9
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JAN 08, 05:19 PM
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Hello Fiero Guys and Gals,
Anyone have success adapting or building an adjustable fuel pressure regulator for the Allante 4.5 engine or the Cadillac 4.9 engine? I'm running out of ideas. Any suggestions or comments would be appreciated. Thanks!
Cheers,
John
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Dennis LaGrua
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JAN 09, 11:24 AM
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It may be possible to cut the fuel pressure regulator from the fuel rail and weld/solder in a piece of fuel line. Then you can cap the return end and be able to locate an adjustable fuel pressure regulator with a T on the fuel line near the fuel filter. Just an idea but I believe it may work. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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Will
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JAN 09, 02:53 PM
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The Northstar regulator is factory adjustable. IIRC, it fits the Allante and 4.9 (and most other GMs of the era...) fuel rails
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Dennis LaGrua
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JAN 09, 03:29 PM
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| quote | Originally posted by Will:
The Northstar regulator is factory adjustable. IIRC, it fits the Allante and 4.9 (and most other GMs of the era...) fuel rails |
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It would have to look like what is used on the 4.9L Cadillac engine;
I don't know of any direct fit adjustable regulator but maybe you can point the OP in the right direction.Looking on Rock Auto they don't seem to list a N* fuel pressure regulator anymore.[This message has been edited by Dennis LaGrua (edited 01-09-2021).]
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fieroguru
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JAN 09, 05:51 PM
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Dennis LaGrua
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JAN 09, 06:45 PM
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That regulator looks like it would be a direct fit on the 4.9L Cadillac rail but at $222 its a pretty expensive option. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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Johns 4.9
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JAN 09, 06:48 PM
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Spadesluck
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JAN 10, 12:50 AM
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Do it and let me know if it works so it saves me the trouble. 
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fieroguru
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JAN 10, 09:51 AM
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Quick look on RockAuto and all the regulators for the 1993 LT1 and 1995 4.9 are the same part number. [This message has been edited by fieroguru (edited 01-10-2021).]
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Will
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JAN 10, 07:25 PM
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Is the Allante unit different than the PFI 4.9?
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