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fuel problems



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Old 01-02-2006, 10:39 PM   #1
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fuel problems

heres my problem. i just put on an electric fuel pump on my blazer. it sits inside the c channel on my frame about 4 to 5 inches away from my muffler. when i drive the truck it runs fine at first, then it starts running lik crap. it will start to sputter real bad and wont run right, then it will die. i think that the fuel pump is getting to hot and vapor locking or something. could it be that the fuel pump is getting to hot, from sitting to close to the muffler. if not, what would you guys think. thanks, shane
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Old 01-02-2006, 11:05 PM   #2
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hmm

I think you answered your own question lol Yep IMHO that is way too close to way too much heat. The pumps are pretty close tolerance inside so it may be locking up from metal to metal contact.
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Old 01-03-2006, 12:28 AM   #3
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thanks, im gonna move it and i really hope that fixes it. any other opinions would still help
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Old 01-03-2006, 12:33 AM   #4
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They say they work best when installed as close to the tank as possible. Are you using the factory pick up or fuel cell sump? Keep it as far from heat as possible.
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Old 01-03-2006, 09:43 AM   #5
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with my experiance's with external electric fuel pumps is they work best if positioned horizontal just a bit lower than the tank and as close as possible to the tank. they are built to be a "pusher" type pump and dont have that great of suction.

hope it is useful
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Old 01-03-2006, 12:27 PM   #6
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Do you have a good return line?
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Old 01-03-2006, 02:43 PM   #7
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what mahana said x2
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Old 01-03-2006, 06:26 PM   #8
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i dont have ne return line, lol.
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Old 01-03-2006, 07:27 PM   #9
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hang on lets back up.

maybe i didnt catch it but are you Carb'ed or Injected? that will make a differance on whether or not you need a return line.

i dont remember my 73 chevy having a return line of fthe edelbrock. I havent touched a carb in over 5 years EFI is awesome once you get a good understanding of it and what it takes to make it run right.
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Old 01-03-2006, 07:30 PM   #10
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he has a carb. no return line.
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Old 01-03-2006, 07:33 PM   #11
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The positioning I talked about should still apply to a low pressure pump as well. try moving the pump and hopefully you didnt fry the pump already.
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Old 01-03-2006, 11:07 PM   #12
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what kind of pump is it?
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Old 01-04-2006, 07:57 AM   #13
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It definitely needs to be as close to the tank as possible and definitely AWAY from the muffler.

Gasoline has a very LOW boiling point and as pointed out earlier this pump should be a pusher.......therefore if you have it too far away from the liquid it is pumping, it could pull a vacuum and in turn lower the boiling point of the gas.

Now this would be ok if gas had a higher boiling point.

Remember, pressure increases boiling point and a vacuum would lower it.

Soooooo, to make a long story longer,...... with the combination of the heat and the location of the pump it looks as though the gas is boiling and not giving you adequete supply.
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Old 01-05-2006, 06:44 PM   #14
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im carbed, and it is a pump from auto zone for about $31.99. it had a return line, but I plugged it.
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Old 01-06-2006, 01:07 PM   #15
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Maybe a silly question, but what pressure is the pump running? If it is too high (more than 7-8psi) you may be blowing by your needle valve and flooding the engine.
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Old 01-06-2006, 03:01 PM   #16
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i think they said it was right around 7 or 8, but im not sure. when i bought it they said that it was the right one for a stock 350
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Old 01-06-2006, 03:18 PM   #17
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Correct me if I am wrong, but if you plug the return line, won't that keep pressure inside the carb and not allow more fuel into it? Kinda like a reverse vapor lock, with pressure instead of vacuum.
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