fuel pump LPH

sinfull90 · #1 03-29-2007, 10:30 PM

what is the LPH rating of the fuel pump for a 6.0l? 255 LPH? i'm going to get rid of the fuel pump in the tank (i go through them fast for some reason... 4 in 3 years) and replace it with an in-line pump so it's easier to replace. i was just wondering if anyone knew what the LPH rating is on the OEM pump. i have a fuel pressure regulator so pressure isn't a problem but the LPH is i'm thinking.

thanx for your help everyone.

lee

MT-2500 · #2 03-30-2007, 03:57 PM

You will be going from bad to worse.
A inline pump will give you a lot more trouble than a in tank pump.
If your inline pump is not lasting there must be a reason for it to be going out.
Running low on fuel. Cheap replacement pumps and bad wiring is the big three.
MT

muff34 · #3 03-30-2007, 09:37 PM

Mt
I have also heard that a clogged fuel filter over time is hard on a fuel pump, makes pump work harder to supply engine .Any truth to that? Sorry to butt in here but was curious.
Thanks Muff

MT-2500 · #4 03-30-2007, 10:58 PM

Right on there. muff34
Dirty fuel filters and running a tank low on fuel is the no 2 killers of fuel pumps.
Mt

sinfull90 · #5 03-30-2007, 11:33 PM

what are the cons of going to an in-line pump VS. the in-tank pump? i'm not really sure why my fuel pump quit... didn't have the time to have a good look at it. it just stopped at once, no whining or hesitation in the throttle at all. do they just quit? checked the fuse and it was fine so i was thinking that maybe there might be a wire that shorted out but again no chance to trace it out before i went to work. the last time it went i had a bit of fore warning with hesitation when you stepped on the throttle but this time it just quit. i was just thinking that i could put an inline pump up in the engine bay and that way if i had any problems in the future it would be easier to get at. the last pump i got was from NAPA so it was an OEM replacement. is there something i'm missing? the pump was for a 4.3l but i'm guessing there is no real difference between the two engine fuel pumps. i know the difference between the fuel injection systems (4.3l is a return style and the 6.0l is a dead-head style) hence the fuel pressure regulator with the return line. now is it possible that the regulator isn't letting enough fuel through the return line as it has 3 different orifice plugs you can put in it? if it wasn't letting enough fuel return, the pump might be working against itself? i'm just brainstorming here. thanx for the help guys.

lee

horse482 · #6 03-30-2007, 11:45 PM

First off, are you cleaning the tank when you change the pump? If the tank is dirty and you put a new pump in it will suck up the garbage from the bottom of the tank killing the new pump. A rep from the company I buy fuel pumps from said that it only takes something as fine as a human hair to kill an electric fuel pump. Second what brand of fuel pumps have you been buying. I sale airtex pumps (witch are not bad), but will only put a gm pump in my truck.

MT-2500 · #7 03-30-2007, 11:53 PM

You need your pump in the tank to keep it cool and just like a water pump they will push a lot but will not pull much.
Newer high pressure pumps need to be in tank mounted.
Proper testing might lead you to the problem on yours.
But Napa is not a good place to get a fuel pump.
They do not carry OEM pumps and there fuel pumps do not have a very good track record.
AC Delco/Delphi OEM pumps are the way to go.
Good Luck
MT

scrapdaddy · #8 03-31-2007, 01:12 AM

i should probabaly start a new thread here

but which idiot in their infinite wisdom decided to put the fuel pump in the tank

is this just some dumb ass designer that decided to put it there so you had to go to the stealership to get it fixed

there was nuttin wrong with the fuel pump on the side of the block like the obs chevys

maybe im ranting too much but i have 230'000 kms on my truck and i havent replaced my fuel pump yet but i know my day is coming

i already priced it out and its gonna cost me from 700-1200 bucks to get it fixed and that sucks cause its ttomuch of a pain in the ass to do it my self

MT-2500 · #9 03-31-2007, 11:04 AM

Actually it was one of there better ideas.
It was the only direction they had to go.
A few tryed the frame mounted fuel pumps but without a pusher in the tank a frame mounted pump will not last long.
Law of liquid pumping.
Quote from post no 7
You need your pump in the tank to keep it cool and just like a water pump they will push a lot but will not pull much.
Newer high pressure pumps need to be in tank mounted.

muff34 · #10 04-01-2007, 12:25 PM

I don`t want to step on any toes here ,but I read something of interest today about the fuel pump going out frequently . It kind of goes hand in hand with what MT 2500 is saying . I know my vehicles won`t be running low on fuel.........LOL http://www.alldatadiy.com/techtips/Chevy/20020920d.html

BlenderWizard · #11 04-01-2007, 12:57 PM

Quote:

Originally Posted by scrapdaddy

i should probabaly start a new thread here

but which idiot in their infinite wisdom decided to put the fuel pump in the tank

is this just some dumb ass designer that decided to put it there so you had to go to the stealership to get it fixed

there was nuttin wrong with the fuel pump on the side of the block like the obs chevys

maybe im ranting too much but i have 230'000 kms on my truck and i havent replaced my fuel pump yet but i know my day is coming

i already priced it out and its gonna cost me from 700-1200 bucks to get it fixed and that sucks cause its ttomuch of a pain in the ass to do it my self

Those block mounted mechanical pumps were cheap and very easily changed, but they could not give our fuel injected engines the pressure they require.

Slowprocess · #12 04-02-2007, 04:00 PM

For the record, I just took the stock pump/assembly out, took it apart, and replaced the old pump with a walbro 255. I had to cut the two wires going to the old pump and soldier up the two new ones that had the new fuel pump connector on the end of it.Then I reassembled the bucket and dropped it back into the tank. Took alittle while to do, but I never drop fuel pressure at any point anymore. I don't know the lph for a stock pump, but there's no way its in the 255 range. I was dropping an enormous amount of pressure at wot with the stock pump. Now its feeding the 31lb injectors and the wet shot without dropping pressure.

wafrederick · #13 04-02-2007, 05:12 PM

Another place not to get a fuel pump from is Carquest,made by Airtex.Put 6 of them in one Chevy Truck and Airtex would not warrenty them.Airtex is another one to stay away from.Airtex also makes fuel pumps for Napa too.Stay away from AutoZone and Advanced for fuel pumps too,their pumps are junk too.

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