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1999 chevy suburban 5.7 4x4 just replaced the fuel pump about 2 weeks ago drove it to church last sunday with my wife and kids and when i came out my burban would turn over but not start got under the truck to listen for the pump and no pump noise so i changed the relay still no pump looked at the relay plug spot under the hood and part of the plastic where the relay sits had started to melt this happen with the old fuel pump and i replaced the relay and the pump came back on ....i dont know what to check im running low on cash and i dont know what the problem could be .........also when i started to have this problem i had this humming noise from the front of the truck when idle thought it was the fuel pump going out but with the new pump i have the same sound ......I had a new engine put in about 5 months ago... I need some help FELLOW CHEVY OWNERS help out the newbie PLEASEEEEEEEEEEEEEEE!!!!!!!!!!!!!!!!!
 

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If it's melted it's probably because it is receiving too much current. First, you would need to make sure that you're delivering the right ammount of volts to the pump it self, and then if you're delivering more than you need, you need to figure out why the fuse or relay isn't blowing before it melts the pump.

I can not get into more detail with you simply because I never did take the electric course at my automotive school, so sorry I can't be of more help.

Just start with basics though, make sure you're delivering the right amount of current, and then check to see why it's melting.
 

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I would check under the backside of where the relay plugs in. Since it's melted, the wires are probably melted on the back & it's only going to get worse untill it's repaired. Some owners have found corrosion on these FP wires causing high resistance & heat. Make your wire repairs with solder joints & protect them with shrink tubing so they won't corrode in the future. Use rosin core solder, not acid core.
 
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