Fuel pump?

[Captn. J]

Trying to determine if my plow truck fuel pump quitted.  It's a 88 350 Tbi. How do I test pressure? I turned on the key and nothing sprays out of throttle body     Any help would be great

[paul]

with it bing fuel injected have to look on the fuel line for wat looks like the end of a valve stem at the throttel body not sure if that yr had it er not i dont think it does but worth a try if it dont then u have to get a pressure gauge and hook it up to the fuel line between the fuel filter and the tank turning on the key wont make fuel spray out in to the throttel body. easy way to determine is have sumone put there ear next to the fuel cap with it off u turn the key on and they should hear a humming noice if u do then the fuel pump is good but it still could b bad next thing to do is spray eaither in the throttel body if it fires right up then u know u got a fuel prob if it dont then its not fuel releted hope this helps and didnt confuse ya kinda have that habit lol

[paul]

also to with a tbi only time fuel will come out the injecter is when the engine is cranking over

[Captn. J]

Being deaf don't help as well.  Guess I ll try starting fluid or have some help

[BIG DOG]

yes try starting fluid  if you can't  find the pressure valve.

[Captn. J]

Don't see any pressure valve.  But I ll keep looking

[paul]

if ya aint found one yet then ya most likly dont have one

[dirtydog]

Not on them til 96 vortec

[J.C.]

Not on them til 96 vortec

x2.

[Captn. J]

what about if i unhook the gas line behind the thottle body  will gas be coming out of that?

[paul]

the one on the drivers side yes but b careful tho as he gas will go everywere i would recomend do it at the fuel filter instead that way the gas will go to the ground instead of the engine bay

[J.C.]

They have a pressure tester adapter that screws on between the tbi unit and the line. You will need to undo a clamp that's hooked to the bellhousing to move the line easier.

[TopFist]

I have everything you need to check it....

[dirtydog]

They have a pressure tester adapter that screws on between the tbi unit and the line. You will need to undo a clamp that's hooked to the bellhousing to move the line easier.

Yeap a real pain in the a$$ if not

[Captn. J]

the one on the drivers side yes but b careful tho as he gas will go everywere i would recomend do it at the fuel filter instead that way the gas will go to the ground instead of the engine bay

but if my fuel pump is shot it wouldnt have gas coming out right?

[J.C.]

Not necessarily. It will still pump,  just not 10+ lbs like it should