1971 Cutlass Ep 39: Aeromotive Fuel System Upgrade @CobblerBob
1971 Cutlass Ep 39: Aeromotive Fuel System Upgrade  @CobblerBob
Uploaded April 2026 | Updated September 2026, 2 weeks ago
This video finally puts to rest a fuel system problem I have been chasing for the better part of a year. I first replace an under-performing fuel filter with a better Aeromotive fuel filter, which helps, but doesn't solve the problem of dropping fuel pressure under engine load. After a wonderful tip from a viewer after I made a plea for help, I replaced the fuel pressure regulator and BINGO! The problem INSTANTLY dissapeared.

0:28 Explanation of where things are at and going
2:03 Fuel Filter comparison
3:03 My "apology"
3:35 The new Aeromotive fuel filter
3:49 "Testing" and taking apart the Speedflow filter that was posing some restriction
6:09 Showing the filter element inside the new Aeromotive fuel filter
6:29 Re-adjusting the Holley fuel pressure regulator for the increased flow of the Aeromotive fuel filter (Notice how difficult it is to adjust)
8:36 Taking my wife out for a test drive... the problem persists!
9:31 Re-sealing the fuel tank while it's apart
11:19 A quick view inside the modified fuel tank & emptying the gas out
11:50 a half-full "slosh test"
12:30 Checking the calibration of the fuel level sensor
12:48 Cold Start!
14:42 Another test drive clearly showing the fuel pressure dropping under load
15:51 I decide to change out the Holley Billet Fuel Pressure Regulator for an Aeromotive A100-6
16:46 The Aeromotive regulator performs better even with the engine off
18:44 The Speedflow filter and it's exorbetently priced replacement filter is easy to blow though when dry?
19:23 Test driving it with my older daughter the new Aeromotive filter!! SUCCESS!
21:47 SHOUT OUT to Matt R. and the Aeromotive Technical Department!
22:22 My daughter's reaction to WOT
23:14 Several 2nd gear WOT tests... SUCCESS!
24:09 Thoughts on the successful test drive... I'm SO relieved!
25:29 My CONCLUSION
25:59 A screen-capturable list of Aeromotive fuel pressure regulators reccommended for a couple of their fuel pumps
27:09 SHOUT OUT to Craig from Florida! THANK YOU!
27:49 Another shout out to Aeromotive Inc!
28:18 3/8 copper-nickel fuel line is NOT 3/8" diameter inside, and -6AN Summit braided fuel hose is NOT 3/8" ID either
29:49 My top 9 Fuel System design tips
37:09 Showing that there is a RESTRICTION in my intake system!
39:02 Closing thoughts & Outro

Parts used:
Aeromotive A1000-6 Injected Bypass Regulators 13109
Aeromotive 10 Microns Fuel Filter with -10 AN Inlet Size 12301
Aeromotive Replacement Fuel Filter Elements 12601 (spare filter element)
Summit Racing™ AN O-Ring to AN Adapter Fittings SUM-220163 (two used)
Permatex Permashield Fuel Resistant Gasket Dressing and Sealant 85420
Summit Racing™ (AEM) High-Flow In-Tank Electric Fuel Pumps SUM-250114
1971 Cutlass Ep 39: Aeromotive Fuel System Upgrade1971 Cutlass Ep 25: Complete A-body Front Suspension!1971 Cutlass Ep 05: A-Body Floor Replacement at Home!Guidos 60th Anniversary Celebration Car Show 2026
Cobbler Bob |

1971 Cutlass Ep 39: Aeromotive Fuel System Upgrade

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