replacing fuel pump 99 Suburban

[centexguy]

I am going to replace the fuel pump in my 99 Suburban. It has about149k miles on it and it has been whining for many months. This truck has quit running at various times over the past few months. It will just die at various speeds and will start right up again. It might run fine for 5 minutes, 5days, 5weeks?(no check engine light no stored codes no warning) I have noticed that when you floor it, the engine kind of hesitates and never seems to develope full power. I need this truck to be as reliable as possible. I figure if its not the fuel pump it has enough miles on it to justify replacement. Any helpfull RnR hints tips, best sources /prices brands to consider-avoid.

[Herb]

IIRC, you have to drop the fuel tank.

[mightybooboo]

Be sure to post back,I want to know if that fixes your problem.

BooBoo

[1eaglescout]

Just incase anybody was wondering, on trucks its easier to remove the bed than drop the tank. Just unhook the tail lights take the four or six bolts loose that hold the bed to the frame and slide it backwards. The pump is then in plain view.

[wilderness1989]

Is this a shot in the dark, the fuel pump? Or have you checked the the pressure at the pump? Fuel pump might be it but I'd check the pressure first.

[Old Vet]

Check and see if it is the fuel pump by measuring the presure in the line. If the presure is right then you may need to just replace the scock on the fuel pump. If the gas has a lot of setelment it will clog the scock and not let enough gas through.

Since you have a surbaban drop the tank. Make sure that it is less than half full. The rest is loosting the bolts on the fuel pump and getting it off. When the pump is off put on a new scock (or filter). Then replace the pump check for any leaks then reinstall the tank making sure that all conections in the fuel line are tight and check for any leaks.

[mightybooboo]

Go ahead and replace any flexible fuel lines to the tank,you wont regret it.
Though on an injected vehicle dont know whats needed,but when you have to drop a tank just to replace hoses,you will wish you had done so before.

BTDT.

BooBoo

[mdharris68]

my 96 sub had close to the same problems but 2 cans of heat in 40 gallos of petro fixed me up after a hard and fast 300 mile round trip.

[Beeman]

Diagnose the problem first before just replacing parts, you can easily wind up creating another problem. After you check the price of a pump you might be more interested in diagnosing, I haven't bought one lately but they were pretty pricey for those years. I like Carter brand pumps but that's just my opinion. I'd rather buy quality if possible as it's too hard to replace them especially the second time for free. The tank has quick release connectors which require a special tool and a double jointed monkey with a high tolerance for pain.
I notice your post makes no mention of level of maintenance. I would start with the basics first and work my way up from there.

When working on or around gasoline be sure not to have any droplights nearby. I have personally seen many people and buildings that were burned by a droplight falling into spilled gas. Also be sure not to have any open flame heaters in the building.