flap flap flap flap... what the?

[Mysteriphys]

short background, truck was running when it was parked and everything still worked, but p.o. took out the gas tank, i jumped the pump so i know it's good, but it doesn't run when i key on, so i put my battery in turned the key and from under the dash i here this *flap flap flap flap* does it for about 10 seconds and stops until i tip to start or off and on again.

anyone have experience with this happening?

 

[1997chevydriver]

Probably the recirculation door actuator for your HVAC unit. Its located above and forward of the blower motor

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[Mysteriphys]

K any thoughts on the fuel pump not running? I can borrow a relay to test but if there is a common issue I'd like to rule it out first.

 

[glfirefighter144]

Check fuses

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[Mysteriphys]

thanks for the advice guys, turns out someone did a crappy job butt connecting the ground for the tank, clamped the wire to the frame and it works. vid in street builds

 

[VenomousSVT]

the flap flap flap is the motor inside the HVAC door actuator. its a worm gear that spins and turns a regular cog... the cog is either cracked or missing a section of about 5 teeth. I had a spare laying around and just took mine apart and swapped the single cog out and it hasnt done it again in 5 years.