Aerotech BT 400-46 Installation And Operation Maintenance page 40

Section 5
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5.56 Fuel Pump Flow Test
5.57 To check if the fuel pump has adequate fuel flow, proceed as follows:
(a) Install pressure gauge with needle valve as in paragraph 5.54. Ensure needle
valve is closed.
(b) Start heater following proper start procedures.
(c) Set heater to 250° and allow to stabilize (approx. 5 minutes). Ensure damper is
in the fully open position.
(d) With fuel pressure at 150 (+/- 2) psi, open needle valve slowly until pressure
drops to 140 psi. Catch bleed-off fuel in a container with one pint marked. The
burner should stay on and operate normally. Observe the time it takes to fill one
pint while maintaining the fuel pressure at 140 psi. If the time taken is less than
2 minutes, the pump has adequate flow. If the time is more than 2 minutes,
replace pump.
(e) If pressure drops quickly when opening valve or burner shuts off, check for air
leaks on pump inlet side (see paragraph 5.58).
5.58 Fuel Pump Air Leak Test
5.59 To check for air leaks, proceed as follows:
Since the fuel flow on purge is about twice the fuel flow of a pressurized pump,
(a) Remove plug on fuel control mounting block and install toggle valve (see
figure 5-6).
(b) Start engine following proper start procedures. Do not engage burner control
valve.
Limit the time toggle valve is open to 30 seconds or less as fuel supply to engine
(c) Open toggle valve and allow a 2 inch depth of fuel to collect in container.
Submerge and of tubing below the surface of the fuel. If air leaks exist in supply
hose, connections or fuel pump air bubbles will be visible in container. Repair
any leaks found.
test for air leak with the heater combustor not fired
is removed when toggle valve is open
AEROTECH HERMAN NELSON INTERNATIONAL INC.
100 Eagle Drive, Winnipeg, Manitoba Canada R2R 1V5
Phone: 204-633-1999 (24 Hours) Fax: 204-694-1612 Email:
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