Product
Engineering Tech Assistance: (310) 830-6875 |
| Symptom |
Diagnosis |
Solution |
| Pump output pressure
is too low |
Adjust
bypass valve per pump instructions (adjustable pumps); check
voltage level/charge batteries - pressure is directly related
to voltage; clean filter (on filtered pumps) |
Adjust
bypass valve per pump instructions (adjustable pumps); check
voltage level/charge batteries - pressure is directly related
to voltage; clean filter (on filtered pumps) |
| Pump output pressure
is too high |
Incorrect bypass valve
setting (on adjustable pumps), or bypass valve re-installed
incorrectly, or pressure change due to increased voltage
(change from 12 to 16 volt system) |
Adjust bypass valve per
pump instructions (adjustable pumps); re-install bypass
valve properly (call tech for directions); re-adjust pressure
to compensate for different voltage. |
|
No
pump pressure
|
No fuel in tank/cell,
or pump motor incorrectly wired, or blockage in fuel lines,
or inaccurate gauges |
Check fuel level - always
keep tank/cell full when racing; check pump wiring against
wiring diagram in tech section of this site; disconnect
fuel line at regulator to check for blockage; check accuracy
of gauges |
|
Pump
won't run at all
|
Pump motor incorrectly
wired, or batteries discharged, or electric fuse blown.
|
Check electrical system
for proper connections and operation |
| Pump seems excessively
hot |
Insufficient voltage,
or excessive aeration |
Check voltage - pump
motor works overtime when voltage is low; check fuel level
- when level is low, pump can suck air from the tank instead
of fuel, causing aeration & overheating |
| Pump seems excessively
noisy |
Excessive aeration of
fuel causing cavitation |
Make sure fuel tank/cell
is full before racing - high volume pumps can actually pull
a "vortex" of air through standing liquid if the liquid
is shallow enough |
| Pump seems to pound or
pulsate against regulator |
Aeration of fuel caused
by: a dirty filter, or a failing pump seal, or a malfunctioning
carburetor needle/seat assembly |
Clean filter; replace
needle/seat assemblies in carburetor; replace pump seal
or send to factory for service |
| Pump leaks at vent hole
|
Damaged seal |
Replace seal or send
to factory for service. Seal should be replaced every
two years. If a fuel system has remained unused for
a long period of time (3 months or more) the seal can dry
out and become unserviceable. Circulate fuel through
system periodically to 'lubricate' seal |
|
Fuel
pressure spikes noticeable on gauges mounted at the regulator(s)
|
Normal operation without
regulator bypass system; expect between 1 to 1-1/2 lb. pressure
fluctuation |
Install optional regulator
bypass system to reduce pressure spiking to within 1/2 lb
|
| Pressure seems to decrease
throughout the day |
Possible voltage drop,
or gauge readings are inaccurate |
Ensure that batteries
are well-charged between rounds of racing; heat can effect
readings on liquid filled gauges - use gauges as tuning
tools only - remove from engine after adjustments
are made |
| Fuel pressure fluctuates
between rounds of racing at the track |
Gauge readings are inaccurate
|
Heat affects liquid filled
gauges. Remove from engine after initial pressure
adjustments are made |
| Car "lays down" at half
track |
Not enough fuel volume
for engine's needs, or not enough pressure to overcome G-force
of launch |
Re-evaluate fuel needs
of engine/vehicle combination. Call Tech for recommendations;
adjust pressure (on adjustable pumps) to overcome effects
of G-force |
| Regulators won't regulate;
they go "wide open" or "creep" |
Dirt particles or other
contaminant causing regulator's needle/seat assembly to
malfunction |
Needs factory repair.
The function of all regulators necessitate the use
of clean, filtered fuel. Make sure to flush fuel lines
before using a newly installed fuel system |
| Regulator(s) "chatter"
|
Excessive air in fuel
system; seal may be damaged and allowing air to enter through
motor, or fuel lines on suction side of pump are not air
tight, or pump is pulling air from under-filled fuel tank/cell
|
Check fuel level.
Always completely fill tank/cell before each round of racing.
Tighten all hose ends on the suction side of the fuel pump.
Air can actually "leak in" through improperly sealed joints.
If all else fails, replace the fuel pump seal or send to
the factory for service |
| Regulators leak from
vent hole |
Ruptured regulator diaphragm
|
Replace diaphragm |
| Fuel spills over into
carburetor(s) |
Incorrect carburetor
needle/seat adjustment, or damaged needle/seat assembly
|
Adjust or replace needle/seat
assembly in carburetor |
Product
Engineering Tech Assistance: (310) 830-6875 |
