Demon-fuel-systems 171021 Manuel d'utilisateur télécharger pdf

171020 – DIAPHRAGM BYPASS (w/ idle bleed jet)

171021 – DIAPHRAGM BYPASS (w/out idle bleed jet)

INSTALLATION INSTRUCTIONS

The diaphragm bypass design reacts faster than traditional poppet bypass valves, which maintain the set pressure with

more consistency. Gasoline applications use the standard bypass #171021 for high pressure mechanical or electric fuel

pumps and #171020 with jet for belt driven fuel pumps. Alcohol applications use #171020 bypass with jet. The regulator

pressure is adjustable between 4.5 and 9 PSI.

Demon™ recommends mounting the diaphragm bypass as close as possible to the carburetor.

As with any fuel system product, proper installation is mandatory for optimal performance. All plumbing instructions hold

true for both the #171020 and #171021. READ THE INSTRUCTIONS THOROUGHLY.

The bypass should be mounted as close as possible to the carburetor (Figures 1 & 2). The return line should be plumbed

with a single #10 line. The return line should expel the bypassed fuel at the bottom of the fuel cell and away from the

outlet. All fuel tanks and cells should have fuel cell foam installed to prevent fuel slosh.

WARNING: DO NOT BLOCK THE RETURN, VENT, OR PUMP FEED. MAKE SURE THAT THE SYSTEM IS LEAK

FREE AT ALL CONNECTIONS TO ENSURE ADEQUATE SAFETY.

To set the bypass pressure, loosen the lock nut and turn the pressure adjustment stud. Turning the stud clockwise will

increase fuel pressure. Turning the stud counterclockwise will decrease pressure. Always remember to tighten the lock

nut after the desired pressure has been set. Most gasoline engines will operate best between 5 psi and 8 psi. Alcohol

engines will require 3 - 5 psi at idle. Additional pressure adjustments may be necessary at the track to tune your system

for optimal performance.

When tuning the idle pressure on the #171020, remember that the larger the bleed jet, the lower the pressure - the

smaller the bleed jet, the higher the idle pressure.

If a repair or rebuild is required, the bypass may be serviced using Demon part #171025 rebuild kit.

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171020 – DIAPHRAGM BYPASS (w/ idle bleed jet) 171021 – DIAPHRAGM BYPASS (w/out idle bleed jet) INSTALLATION INSTRUCTIONS The diaphragm bypass desig

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Modèles reliés 171020

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