Mercedes-AMG M177 / M178 Fuel System Upgrades

Fuel system upgrades from Spool Performance for the Mercedes-AMG 4.0L twin-turbo V8 (M177 and M178). Listings cover the C63, E63, GT and GT63, G63 and G550, GLC63, GLE63, GLS63, S63 and SL63, and the Aston Martin...

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About Mercedes-AMG M177 / M178 Fuel System Upgrades

Fuel system upgrades from Spool Performance for the Mercedes-AMG 4.0L twin-turbo V8 (M177 and M178). Listings cover the C63, E63, GT and GT63, G63 and G550, GLC63, GLE63, GLS63, S63 and SL63, and the Aston Martin Vantage V8, which uses the same engine family.

The range has FX-200 and FX-350 high pressure fuel pump kits, Stage 3 low pressure fuel pump upgrades and wireless ethanol analyzer kits, so a tank-to-rail fuel upgrade for E85 can be put together from one page. Check the model and year in each title before ordering.

See Mercedes-Benz performance parts or fuel system upgrades.

Frequently asked questions

Should I upgrade the LPFP or HPFP first on an M177?

Log fuel pressure to find the limit. On ethanol builds both usually need upgrading, and the low side should be able to feed the high-pressure pumps you choose. Our M177 / M178 fuel system guide lays out the usual path.

How many high-pressure pumps does the M177 use?

Two. The Spool FX-200 and FX-350 kits for M177 models include two pumps, and the FX-350 kits add a 10-micron high-flow filter, upgraded lines and hardware, with the ethanol analyzer optional.

What is the difference between the FX-200 and FX-350?

The FX-350 runs at 35 MPa (350 bar) versus 25 MPa on the FX-200, according to the E63 and G63 listings, which lets the injectors flow more fuel within the injection window. The FX-200 has a bigger bore than stock and is described as fully E85 compatible and plug-and-play.

Does the AMG GT use the same kits as the C63?

No. The two-door AMG GT, GT S, GT C and GT R use the M178 and have their own kits. The C63, E63, GT63 4-door, G63, GLE63 and GLC63 use the M177. Always order by model and confirm the engine for your car's year.

Do I need a tune for these fuel upgrades?

Yes, plan one. Upgraded pumps are meant to be paired with a calibration that uses them, so ask your tuner which pump their tune is built around before you order. If you run E85, add an ethanol analyzer so the tune knows what is in the tank.