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99 7.3L...no fuel pumping into bowl.

56K views 14 replies 11 participants last post by  Brando 
#1 ·
A friend of mine was on his way to the motion lotion station and truck quit on him. he figured he ran it outta fuel. he put about half a tank in it and kept cranking and cranking it all day yesterday and couldnt get it to start. i went over to check it out and the fuel bowl is not filling up. its got the electric pump on the frame rail. when you turn on the key its runing and sounds normal. but thats the only thing i think it could be is that fuel pump...any other suggestions what it might be?
 
#2 ·
From what I no, the pump should fill the bowl.. I would check to make sure the pump it self is getting fuel...
 
#3 ·
i just replaced a bad pump that would still turn on, and sounded pretty normal. Pull the line off before the pump and see if its sucking.
 
#5 ·
He said the bowl would not fill. Either a bad pump ar blockage someplace between the pump & tank or something in the tank. But just because you can hear it doesn't mean it's pumping.
 
#6 ·
Sometimes opening the valve and cranking it will get it flowing. If that happens, I would think it meant you have a weak pump though.

I would check flow from the tank before I assumed bad pump though.
 
#7 ·
Motion lotion station? I was going to go get some porn damn it!

I have no flow before or after the pump. I've read there may be no in tank pump on some 99's? The pump seems to be flowing using my highly technical thumb over each end analysis, albeit not too strong. Is there a pump in the tank, or just a mixer for the pickup and return lines? Im going to blow some air through the line back into the tank today tomake sure it isn't blocked, thenreplace the frame pump if that doesn't do anything. Will blowing back through hurt anything? Im guessing since its already full of air, it shouldn't.
 
#8 ·
these trucks do not have pumps in the tanks... If you are gonna blow into the tank do it through the fuel filler instead... pressurize the tank a little and fuel should come out through the fuel line
 
#9 ·
If you're going to pull it all apart anyway just replace the lines. Id be looking into my fuel filter housing though to get a better idea of whats in/been in my fuel lines. Id follow ggf's^ advice. Pressurize the tank and the fuel will flow to the pump unless its a blocked line. Did you draw any fuel from the half of a tank you just got? Maybe its got junk in it.

That'd be a great way to burn up a new pump, hooking it up to blocked lines.

Good luck!
 
#10 ·
Tried pressurizing the tank when everything was hooked. Nothing made it to the fuel bowl. Ill try it again today and see if I get anything out of the line while disconnected. Im still 99% positive I ran it out of fuel, ut had been reading 1/8 tank fir a couple days, which finally connected in my head when the low fuel light kicked on. I was on my way to the station when it died, I just let it coast into the station and up to the pump, I think it sucked some crap from the bottom of the tank up and clogged it, then probably burned the pump up from all the cranking I did the rest of the day.
 
#13 ·
good deal.
 
#15 ·
I know this thread is old but incase someone else is having this trouble. The apparatus in the tank is a sending unit , the pump is under the driver seat on the frame rail. Inside the tank in the bottom of the sending unit they’re 2 screen filters and a pick up screen. Mine were full of crap. 30$ at oreilly or you can clean them up
 
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