


GFB FX-S Bosch Fuel Pressure Regulator
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
GFB FX-S Bosch Fuel Pressure RegulatorIf you increase the performance of your engine, you need to ensure your fuel system can deliver the goods or you're going to have a bad day! Upgrading the fuel pump is the first step, but doing this alone will usually result in excessive fuel pressure, especially at idle. This is because the factory Bosch regulators typically don't flow enough to support larger fuel pumps, especially with turbo E85 setups that demand high fuel flow rates.
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Your GFB FX-S Bosch Fuel Pressure Regulator orders ship within 1-2 business days.
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- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
Based on 979 reviews
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Product Reviews
★★★★★ 4
Weak but excellent please read.
Size: 50ft, Color: Black
Breaks a lot, but Is 100% convenient. My third annual purchase. Beats rubbing stuff off of twisted rubber hoses.
Darned if u do. Darned if u don't. A 5-10 yr version one of these will outsell the entire market.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
★★★★★ 5
good price / great filter
Style: 4 PACK, Pattern Name: Standard MERV 8
Aerostar is a good filter / merv 8 is the one for me, great air flow - Heat & AC.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 25, 2026
★★★★★ 5
MERV-8
Style: 6 PACK, Pattern Name: Standard MERV 8
NOT QUITE HOSPITAL RATED, BUT VERY GOOD FILTER AT GOOD PRICE. DON'T CHANGE FILTERS TOO OFTEN: THAT TOP LAYER OF FILTERED MATERIAL STOPS LOTSA SMALLER NASTY BITS FROM GETTING THRU
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Reviewed in the United States on October 27, 2025
★★★★★ 5
It just works
Style: 6 PACK, Pattern Name: Standard MERV 8
Works exactly as advertised!
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Reviewed in the United States on April 18, 2026
★★★★★ 4
Looks like good quality
Style: 6 PACK, Pattern Name: Standard MERV 8, Style: 6 PACK, Pattern Name: Standard MERV 8
Looks like good quality. Only issues are they are not individually wrapped and the markings are confusing as one side says merv 8 one side says merv 11 and one side says merv 13
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Reviewed in the United States on October 16, 2025
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