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Joined: Mar 2011
Posts: 457
4
Shop Shark
Shop Shark
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Joined: Mar 2011
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OK, have a stock 350 Chevy using an electric fuel pump, mounted near the tank per manufacturers recommendations. Runs great, no problems, until it is really hot, like yesterday (95.) After driving, when I stopped to get gas, had car shut off for 10 minutes or so, turned on key, and the pump made the loud hammering, indicating it was sucking air. I started the car, no problem. But the noise continued for maybe 30 seconds, quieted down, and I drove home 30 miles. Usually, it just clicks, but since it got hot, this is happening. Any thoughts, suggestions, or whatever would be appreciated!!


1940 Chevy 1/2 ton pickup "KC"
A day without sunshine is like, well, ..... dark!
Joined: Jun 2011
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C
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Sounds like an issue with the pump, is there an tech line for the manufacturer?


Give me ambiguity
or give me something else
Joined: Sep 2011
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B
'Bolter
'Bolter
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Originally Posted by CASO
Sounds like an issue with the pump, is there an tech line for the manufacturer?


Or a suction side leak.


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
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Retired GM dealer tech. 1980 - 2022
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L
'Bolter
'Bolter
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Just a thought. If the tank is not properly vented and builds a small vacuum, then when the pump shuts off (when truck is off) the vacuum in the tank sucks the pump intake line dry. This would possibly be irratic and not occur on short trips, but only longer ones when vacuum has time to build up. Easy test is to remove the gas cap and stuff a rag and see if problem goes away. Also see if you feel a vacuum when you release the gas cap. Just a thought. I hope it's an easy fix. thumbs_up

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Shop Shark
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Thanks for the ideas, will check them out this week. Any more are welcome. smile


1940 Chevy 1/2 ton pickup "KC"
A day without sunshine is like, well, ..... dark!

Moderated by  Phak1, Woogeroo 

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