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New Fuel Pump Bad?

papashaq

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papashaq Enthusiast

papashaq

Posted
Posted

I replaced the fuel pump in my truck and it wasn't pressurizing my fuel system. I pulled it back out and placed it in a bucket of gas and I hooked up the wiring and it took a few turning on and off with the key but it did get fuel up into the clear tube that goes to the top of the unit. so I hooked it all back up and put it in my tank and tank back on truck and after many on and off's with the key I still can't get my fuel system pressurized. (I have a pressure gauge hooked up) Was I supposed to prime that pump first or what gives?

Why is it not pressurizing my system? I don't have a lot of gas in the tank and don't want to put more in if I have to drop the tank again, but I had enough for the old pump to run the truck. What am I doing wrong?

I just unhooked the fuel line before my filter and there was no gas there.

 

 

Optional Information:

Year : 2001

Make : Chevrolet

Make (other) : Silverado

Model : 2500 HD

Engine : 6.0

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted
I replaced the fuel pump in my truck and it wasn't pressurizing my fuel system. I pulled it back out and placed it in a bucket of gas and I hooked up the wiring and it took a few turning on and off with the key but it did get fuel up into the clear tube that goes to the top of the unit. so I hooked it all back up and put it in my tank and tank back on truck and after many on and off's with the key I still can't get my fuel system pressurized. (I have a pressure gauge hooked up) Was I supposed to prime that pump first or what gives?

Why is it not pressurizing my system? I don't have a lot of gas in the tank and don't want to put more in if I have to drop the tank again, but I had enough for the old pump to run the truck. What am I doing wrong?

I just unhooked the fuel line before my filter and there was no gas there.

 

No priming required....would be easier to pull the bed versus dropping the tank.....what brand of fuel pump did you go back with?

papashaq Enthusiast

papashaq

Posted
  • Author
Posted

I couldn't get the bolts off to pull the bed...believe me I tried. The new one I bought was a no name off of ebay...Yeah I know, but I thought it would work for at least a little while.

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted
I couldn't get the bolts off to pull the bed...believe me I tried. The new one I bought was a no name off of ebay...Yeah I know, but I thought it would work for at least a little while.

 

Well if you've got power/ground to the pump and you're getting no pressure I'm sure you know what the problem is....any warranty on the pump?

papashaq Enthusiast

papashaq

Posted
  • Author
Posted

Yes, one year...but I think I am going to try and return it to the seller and go get a delco from auto zone. What I should have done the first time!

 

 

Thanks for the help...I'll let you know if the new one helps!

jblakeney Senior Enthusiast

jblakeney

Posted
Posted

Sup,

 

Pump is more than likely bad.

 

The pump you got did they ask you about EVAP or NO-EVAP or for a 3 letter code off your old pump???? The pump in your truck is ONLY I MEAN ONLY available as a complete DROP in unit. I have seen people at my store with EBay pumps where they sent ONLY the pump not the unit.

 

As far as I am gathering you took the wiring off the frame placed the pump assembly in the bucket of gas with out anything to allow back pressure at the pump... (air came backwards into the pump causing a no-priming issue) A new pump should not have done that but a weak old one will. Usually you have the line in front of the pump plugged into the pump keeping the air in front of the fuel entering the pump…

 

 

 

When you crank the vehicle it primes the system and discharges the air out of the fuel injectors and does not allow the pump to suck air in. You need 10 gallons in the tank upon start up of the replacement pump to insure that the pump will be submersed in fuel to keep it cool. If the pump gets hot on start up it will burn the pump up maybe not right now but will greatly decrease the life of the pump..

 

 

Delphi # FG0053 is probably the unit that your truck takes (EVAP Emissions).... (3 letter code on top of pump assembly TCF) 1 white and 1 black electrical connector...

 

Delphi # FG0271 is without EVAP Emissions (3 letter code on top of pump assembly TCU) 2 white electrical connectors

 

Past that make sure you have 12 volts back at the pump on the hot wire.... In the fuse box there should be a primer jumper for the fuel pump... Disconnect the pump wiring that the top of the fuel pump assembly and check for 12 volts after the jumper has be set in place. (Note do not do this and leave a pump ON for more than 5 seconds trying to prime a pump!!!!!!!!!) Either an Oring will give somewhere [begin to leak] or the pump fails!!!!

 

 

 

 

 

Just my 2 cents worth take it or leave it.... This is a problem I face quite often..... I am NAPA store jobber...

 

Jbo

papashaq Enthusiast

papashaq

Posted
  • Author
Posted

Wow Jb, thanks for the great post, I appreciate it.

 

It was a complete drop in, but they did not ask for any EVAP or codes or anything like that. I just now looked at the old pump and it says TCU on it. It had a 4 prong harness for hook up...I assume a hot, a ground, and 2 for the sending unit.

 

So this primer Jumper you are talking about...I don't recall anything like that in my fuse box...are you saying to jump the relay so it is always on so I can test the voltage? Obviously after I disconnect the pump harness so I don't burn the pump?

 

Thanks for the help, I'm getting frustrated with this truck...been working on it for 2 weeks now...I miss/need my truck back!

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