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Old 06-18-2011, 04:47 PM   #1
kks
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fuel pump ques for 1954 chevy truck 1/2 ton

Question #1: I have gas coming from the tank to the fuel pump, from the pump to the filter is where I have a problem. I put a clear fuel filter on it to see if gas is making its way up the line and into the filter. Its not making it there. Now if I take the line off and point it down gas flows out of it, but when its hooked back up the filter and pointing up, no gas comes to the filter. Its gotta be the fuel pump right?

Question #2. The pump thats on there now has to lines. Each coming into each side of the pump. IE one on the left (coming from the tank) and one on the right that leads up to the filter. Can someone tell which fuel pump I need to replace this one with? Thanks
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Old 06-18-2011, 06:02 PM   #2
JW 54
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Mechanical Fuel Pump

I replaced mine last year. I bought it at O'Reilly's. Part #4149. cost me $42.00 works great. Hope this helps.
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Old 06-18-2011, 06:07 PM   #3
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Re:

Wow sounds like a good price. Also check out this site. Good luck kks !
http://shop.advanceautoparts.com/1/3...ruck-fuel-pump
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Old 06-18-2011, 06:13 PM   #4
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Quote:
Originally Posted by kks View Post
Question #1: I have gas coming from the tank to the fuel pump, from the pump to the filter is where I have a problem. I put a clear fuel filter on it to see if gas is making its way up the line and into the filter. Its not making it there. Now if I take the line off and point it down gas flows out of it, but when its hooked back up the filter and pointing up, no gas comes to the filter. Its gotta be the fuel pump right?

Question #2. The pump thats on there now has to lines. Each coming into each side of the pump. IE one on the left (coming from the tank) and one on the right that leads up to the filter. Can someone tell which fuel pump I need to replace this one with? Thanks
Just for the heck of it you should try running a line from the inlet side of the pump down to a can of gas then crank the engine over and see if gas comes out of the outlet side of the pump. You might have another problem. Never hurts to be sure...Big Tim
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Old 06-18-2011, 07:18 PM   #5
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Originally Posted by bigtimjamestown View Post
Just for the heck of it you should try running a line from the inlet side of the pump down to a can of gas then crank the engine over and see if gas comes out of the outlet side of the pump. You might have another problem. Never hurts to be sure...Big Tim
True, bigtim. Gas will naturally flow out the inlet side by gravity by virtue of the placement of the gas tank.
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Old 06-18-2011, 08:43 PM   #6
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Pull both lines from the pump (plug the one from the tank so gas doesn't run out) and have a helper spin the engine with the starter. Put your thumb over the inlet fitting and it should suck a vacuum on it; then put a finger on the outlet fitting and it should build pressure. If not the pump is bad. Remember these are only 2-3# pumps so the suction or pressure isn't huge.
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Old 06-18-2011, 09:13 PM   #7
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Post Fuel Pump Testing

What Evan said ;

When you're checking the flow into the pump , fuel must GUSH out the inlet pipe from the fuel tank , not just pour or dribble .

KEY OFF ; crank the engine with the outlet side of the pump disconnected , your should get a solid stream of fuel at least 4" long each time it pumps .

The Airtex pumps in the link , are top quality , the first one for $79.00 , is a " Dual Action " typ , this means it is actually two pumps in one and creates vacuum so your wipers won't stall when accelerating or going up hills .
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Old 06-18-2011, 09:52 PM   #8
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Check for kinks in the fuel line as it will restrict the flow of fuel into the carb.
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Old 06-19-2011, 09:14 AM   #9
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You can also use a vacuum gauge to test for fuel pump pressure . Just hook the line on the gauge to the outlet side of the pump then spin the engine over. It should read 2-4 PSI. Then do a volume test by placing the outlet line in to an old coffee can and spin the engine over. It should start filling the can at a fast rate.... Big Tim
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Old 06-19-2011, 11:14 AM   #10
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Quote:
Originally Posted by ccharr View Post
Adding to what Ken stated while looking for the kinks also check for cracked lines that let in air as a straw will do with a fracture in it. I replaced the fuel pump, fuel lines, filter bowl, and added in an electrical fuel pump wired to a starter button under the dash to get rid of a fuel problem that included not enough fuel and it vapor locking in the summer time such is here now.
If when you test the fuel flow and you have some air around blast a shot of air back up the line into the tank, have the cap off or loose or you will get a flow about 2 ft. long back at you, as soon as you take the air away.
Look back at some of the old posts and testing with another fuel pump it you have one, as I remember from a post by Big Tim a Chevy V/8 pump
(265/283/327/350 ci.) turned upside down will work if you have one around.
If you have the $'s just buy another one because the old one has set has all the sludge in it and is going to fail on you as soon as you are 20 some miles away from home and you left your phone at the house. Look at some of my posts on the electrical pump and the photos in the threads, they have some very good posts from our Friend’s Here, Hope this helps out some. Btw my truck has the tank under the bed I believe yours in in the cab.
Happy Fathers Day too
Good memory on the upside down pump, but that was a big block chevy fuel pump that you could turn upside down and would work on the 235/261 engines ....Big Tim
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Old 06-19-2011, 11:31 AM   #11
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Quote:
Originally Posted by bigtimjamestown View Post
Good memory on the upside down pump, but that was a big block chevy fuel pump that you could turn upside down and would work on the 235/261 engines ....Big Tim
Thanks for correcting that, I could not find the post or thread which had it.
I guess I should try out the work I did on my fuel system to see if I really did get the vapor problem fixed by taking a long ride in it into the hot upper desert. the trucks fuel system had cracked lines, bad fuel pump and what ever else could be wrong. I did find the aluminum clothes pins Nate spoke of, now he has some also. Again Thanks Tim.
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Old 06-22-2011, 11:42 AM   #12
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I bought the airtex dual fuel pump. The question I have now is, the dual pump has outlets for the wiper and the pump that is on there now only has an inlet and an outlet and that is it. Do I need to hook something up for the wipers on the new pump. or just run the lines like the pump thats on there now? Thanks
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Old 06-22-2011, 02:26 PM   #13
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Post Dual Action Fuel Pump

Just connect the fuel lines .

You'll be making a big mistake not to take advantage of the vacuum side though .
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Old 06-22-2011, 02:37 PM   #14
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Can someone tell me how to hook the vacuum up? IE how, to what, where.
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