Likely your original electric fuel pump. Else might be your electronic tag axcel controller pinging the electric brakes. If its the brakes, you'll hear it on both sides. Look under the unit in front of the fuel tank and you will find fuel pump.
You have twin beds?
You hear this inside?
When hooked up to power? or engine running?
Does it ever stop while power is on?
Is hot water heater trying to light?
Or rear gas heater pilot?
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1989 Airstream 345 Liberator...
1972 Argosy 24'... 1954 Feathercraft Vagabond
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