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Fuel Pressure External Regulator Plug w/ Gauge for LS Truck Intake Manifold Rail

Marsoni M251S
Sale price$36.99
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Get it in 3 business days with 1 day shipping. Friday, May 29
Fuel Pressure External Regulator Plug w/ Gauge for LS Truck Intake Manifold RailLS Fuel Pressure Regulator Plug with 1 8" NPT Gauge Port Installs in place of factory integrated fuel pressure regulator that is mounted to the fuel rail on truck intake manifolds *** Not compatible with Flex Fuel rails, see part number 551244 125NP *** Required when using an external fuel pressure regulator Compatible with (1999 2003) LS Gen 3 truck SUV round fuel rails Made in Wichita Kansas, from aerospace grade billet aluminum Includes plug and
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  • We offer a 30-day return/exchange service after receiving.
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4.4 ★★★★★
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Jeff Pesos
Battle Creek, US
★★★★★ 4
Works like a supplement
If you use it and see a difference, you will blame it on this cleaner, if not, you will say the product does not work. Exactly like your weight loss supplements! Who knows what this stuff does, but it may do something. Or maybe it does not.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2026
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Verified Purchase
Michael Sliwinski
New York, US
★★★★★ 5
Used to clean an O2 sensor
Seems to have resolved an issue with a wavering idle for my 89 Mercedes 300e with 468,000 miles.
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Reviewed in the United States on March 27, 2026
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Verified Purchase
Marvin Burton
Lexington, US
★★★★★ 3
Nothing
Didn’t work for me
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Reviewed in the United States on May 26, 2026
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Verified Purchase
mechanic
Chelsea, US
★★★★★ 1
It doesn’t work
This don’t work at all. I do not recommend. I use all four containers, and the light is still on.
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Reviewed in the United States on May 20, 2026
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Amazon Customer
Fort Morgan, US
★★★★★ 5
2014 Ford Edge SEL
Worked like a charm! Used as directed, it cleared the P0420 & P0430 codes that were coming up on my OBD II scanner after a complete engine swap. Definitely recommend this product.
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Reviewed in the United States on May 23, 2026

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