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Author Topic: fuel pumps (for EFI motors)  (Read 5255 times)

Offline p7387

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fuel pumps (for EFI motors)
« on: October 24, 2009, 09:37:10 am »
hey guys:
i have separated this from my prior post on "gas tank replacement"

concerning the fuel pump on a 87 EFI motor. i will need to replace the tank and the brackets on my truck due to severe rust. i have not yet pulled the tank so i do not know what condition i will find the tank and sending unit/pump. given the cost of all the parts this is starting to become a expensive project. common sense dictates that i might as well replace the pump and sending unit along with all related hoses at this time as well. my question--is it better to try and reuse the existing pump/sending unit or replace it all with new aftermarket. i would rather use AC delco parts but they are too expensive, but at the same time i do not want to go through all this work and use cheap aftermarket junk that will break in 12 months. is there any aftermarket stuff that would be comperable in quality to AC. also - am i correct in understanding that the sending unit and pump are two separate items? it seems like the sending unit is more offensive in price.

thanks for your opinions
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Offline VileZambonie

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Re: fuel pumps (for EFI motors)
« Reply #1 on: October 24, 2009, 09:40:47 am »
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Offline 1HI4x4

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Re: fuel pumps (for EFI motors)
« Reply #2 on: October 24, 2009, 10:02:04 am »
Great link Vile'
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Offline Captkaos

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Re: fuel pumps (for EFI motors)
« Reply #3 on: October 25, 2009, 09:10:03 pm »
The pump is housed in the sending unit, you would need to get both and they are expensive.  Generally the sending unit doesn't go bad, but the pump will sometimes.
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Offline aussie

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Re: fuel pumps (for EFI motors)
« Reply #4 on: November 11, 2009, 07:31:11 pm »
does anyone know how the sending unit works on the EFI  !!! wHat i mean is, there is  a 2 wire plug coming from the sending unit but how does the gas gauge work!!! where is there  a third wire to from the gauge to the sending unit?????
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Offline Marc

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Re: fuel pumps (for EFI motors)
« Reply #5 on: November 12, 2009, 04:34:53 pm »
One is power to the pump, and one is for the gauge.  It grounds to the metal frame of the unit.  I would think there should be a wire fastened to the unit, but mine was rebuilt and there was a wire soldered to it that I grounded on the frame of the truck.
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Offline aussie

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Re: fuel pumps (for EFI motors)
« Reply #6 on: November 13, 2009, 07:17:53 am »
ok i ran both to the relay on my 5.3 conversion so i need to find which one  has no power????
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Offline VileZambonie

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Re: fuel pumps (for EFI motors)
« Reply #7 on: November 13, 2009, 08:16:55 am »
Quote from: aussie on November 13, 2009, 07:17:53 am
ok i ran both to the relay on my 5.3 conversion so i need to find which one  has no power????


Say what?
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10
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