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post #1 of (permalink) Old 07-10-2009, 11:44 PM Thread Starter
Journeyman
 
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fuel pump

i've been through 4 electric feul pumps none of them can keep up with the carb. i'll make it threw the 1st 2 gears at wide open,then it dies. tried autozone specail , stock burnd up, tried speed shop they don't know. theirs burned up faster. back to another autozone. it will roast the 33x12.50 like their nothen. the carb is 780 spread bore. any help appretiated.
mike
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post #2 of (permalink) Old 07-12-2009, 02:03 PM
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Do you think it could be that the carb is pulling too much CFM for the fuel pump and that is causing the pump to work too hard? I really don't know what it could be, that is just the first thing that came to mind. Or maybe there is some type of obstruction keeping the pump from getting enough fuel through it to keep it cool.
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post #3 of (permalink) Old 07-12-2009, 08:42 PM
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Any chance the fuel pickup in the tank is getting clogged? Such as the sock being dirty and causing the pump to pull excessively hard.

Devin

2007 GMC Sierra Classic 2500HD SLT, 4x4, EC/LB, LBZ/Allison, Summit White with Charcoal Leather, dealer installed Westin Platinum Series bars and a Line-X.

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post #4 of (permalink) Old 07-12-2009, 11:02 PM Thread Starter
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i pulled the stock pump thinkin that,( workin on gravel drive way/ no floor jack whishin that i was in a pool.) anyways the only thing in the tank is 3/8 rubber line. think maybe with no bafels in the tank that the fuel is movin away from pickup, 90 suburban think its a 40 gallon? all i know is that i've got to put in a concrete drive. that thing is heavy when its full. gas gauge don't work so i towed it to the gas station and filled it.thanks again
mike
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post #5 of (permalink) Old 07-19-2009, 09:43 PM Thread Starter
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burned up another pump at 1500 rpm /full tank.debating on going to 1/2 " line? preaty bad i picked up another pump just in case, only down for ten minuts.
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post #6 of (permalink) Old 08-08-2009, 11:48 PM
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have thought about running frame mounted pump along with the intake pump. kinda like lift pump for intake pump

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post #7 of (permalink) Old 08-12-2009, 12:51 AM Thread Starter
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i tried that, the pump by the motor burned up about 2 seconds after the one by the tank. got laid off so waitin on this till after i findnew job. I think that i will setup a small tank under the hood(about a gallon) with a pump between the two tanks, and next to the carb. might put a chiller can in there to?the line out of the small tank 1/2" see if that helps. it might give me a beter idea of flow? any help or expeirance on this needed, please.
mike
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