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Old 09-21-2010, 12:11 PM   #1
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1988 34.5' Airstream 345
Livingston , Texas
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Fuel pump question 1988 345

Is the fuel pump that is behind the tag axle supposed to humm when the ignition key is turned on? I am a newbie to this MH.....just fixed a leak on the air suspension that caused the air compressor to run constantly, but now that the compressor doesn't run all the time, I can hear the fuel pump. I don't know if the humm is normal or if the fuel pump is going out.

Thanks for any help. Moe
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Old 09-21-2010, 12:55 PM   #2
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All electric fuel pumps make a humming sound,usually louder when you first turn on the key,the newer units have fuel pump in tank,that keeps them a lot quieter. Dave
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Old 09-22-2010, 04:09 PM   #3
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Thanks for the info! Moe
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Old 09-23-2010, 08:14 AM   #4
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1989 34.5' Airstream 345
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Our 89 hums...it's when it doesn't that I worry...last time it shut up, it got replaced...I now carry a spare...I hope the in-tank never requires replacement...m
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Old 09-23-2010, 05:05 PM   #5
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1988 32.5' Airstream 325
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Mine always hums and good advice to carry a spare! I travelled from hamilton to buffalo it would run for a mile then run out of gas!! Did not know it had a pump at tank !! the two hour trip took two days even rv shops were stumped!!
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Old 09-23-2010, 11:18 PM   #6
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1989 34.5' Airstream 345
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The main problem with 34.5 feet of motorhome is that when it doesn't work, it's a BIG albatross...however, when it's running smooth, it's an eagle...wish I could predict the flight pattern...glad that isn't my main aim...we'll drive it till it dies or we do...m
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Old 09-30-2010, 04:17 PM   #7
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OK...decided to replace the fuel pump. Any idea on part numbers for the pump. Can't find any info on replacement. Looked at a Holley Red Fuel Pump, but I am not sure what flow rate is required. Thanks for any help.

ps on a 1988 345 with 454 chevy p30
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Old 10-01-2010, 03:12 PM   #8
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Replacement fuel pump

Quote:
Originally Posted by moeriv View Post
OK...decided to replace the fuel pump. Any idea on part numbers for the pump. Can't find any info on replacement. Looked at a Holley Red Fuel Pump, but I am not sure what flow rate is required. Thanks for any help.

ps on a 1988 345 with 454 chevy p30
I think I would call someone like Jegs and ask them what they recommend ,I`m sure they know what would work good for you. Dave
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Old 10-02-2010, 07:25 AM   #9
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Quote:
Originally Posted by moeriv View Post
OK...decided to replace the fuel pump. Any idea on part numbers for the pump. Can't find any info on replacement. Looked at a Holley Red Fuel Pump, but I am not sure what flow rate is required. Thanks for any help.

ps on a 1988 345 with 454 chevy p30
I have found that NAPA, has them in stock, most Stores

about $100. to $140.00 and that is with a new fuel flow controller.
I replaced mine in Florida this winter, and purchased a spare also.

For ease, I also purchased Two Brass Ball Valves and put them in Line, before and after the Pump. this way I can shut the valves OFF. and replace the Pump with Little fuel loss, draining.

IF, You have a Plugged Fuel Filter ? The Pump will HUMMMM ?
Louder I have Found.
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Old 10-02-2010, 08:00 AM   #10
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On my 89 have never noticed a hum even when the filters were plugged.
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Old 10-02-2010, 09:54 AM   #11
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When I purchased my motorhome I was running out of fuel on hills. The fuel pump at the tank hummed but it wasn't pumping fuel. I checked by taking off the out line at the pump. Purchased new pump, that eliminated the problem.
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Old 10-02-2010, 12:29 PM   #12
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I replaced my fuel pump with a Holley12-802-1
The other # on the box is 90127484296
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