fuel pump test???
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Fleet Owner
Joined: Dec 2000
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From: Central PA
fuel pump test???
Two Saturdays ago my 54 F-100 left me sit along a back road. IT was not getting gas. Looked like it was the fuel pump. Towed it home.
I had replaced the fuel pump about 4 or 5 years ago with a pump I got at Advanced Auto. In the mean time I bought a NOS fuel pump with the glass bowl on ebay. So I thought easy switch. I put it on but it did not pump gas. I thought maybe the NOS one did not work. Someone noted that maybe my gas tank pickup tube is blocked. I put gas in a jar and the fuel pump did not suck any gas up from the jar. I took the pump off and put it on again thinking the arm was not in proper contact with the cam. With the pump not sucking gas out of the jar that rules out my pickup tube being blocked.
The pump sounds like it is sucking air or pumping when I move the arm when it is on the bench. What else can I do?
I could buy a new pump for $50 bucks at Advanced but I want to make sure the fuel pump is the problem before I buy one and put it on and can not return it...
How can I make sure my NOS pump is or is not working?
I had replaced the fuel pump about 4 or 5 years ago with a pump I got at Advanced Auto. In the mean time I bought a NOS fuel pump with the glass bowl on ebay. So I thought easy switch. I put it on but it did not pump gas. I thought maybe the NOS one did not work. Someone noted that maybe my gas tank pickup tube is blocked. I put gas in a jar and the fuel pump did not suck any gas up from the jar. I took the pump off and put it on again thinking the arm was not in proper contact with the cam. With the pump not sucking gas out of the jar that rules out my pickup tube being blocked.
The pump sounds like it is sucking air or pumping when I move the arm when it is on the bench. What else can I do?
I could buy a new pump for $50 bucks at Advanced but I want to make sure the fuel pump is the problem before I buy one and put it on and can not return it...
How can I make sure my NOS pump is or is not working?
Hotshot
Joined: Oct 2009
Posts: 16,188
Likes: 4,795
From: Burbank, WA
If you can put your finger over the inlet port and feel a suction when pushing the plunger, the pump is probably ok. It may just need a priming. Try to pour some gas into both the inlet and outlet ports so there's gas in the diaphram, then hook it up and try it again. You can try to see if operates by hand first, but it would probably work better mechanically.
Fleet Owner
Joined: Jul 2004
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From: NM
When you say "NOS", is it really a pump made in the '50's? If so, it most likely has a rotten diaphragm, and exposure to modern gas would very quickly eat it up even if it was still intact. Old style diaphragms aren't compatible with MBTE, ethanol, and all the other stuff they add nowadays. I'd open it up and look at the diaphragm if it doesn't pass the finger test Wayne describes. Put a modern diaphragm in it (from a kit) and you'll have the best of both worlds.
Thread Starter
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Fleet Owner
Joined: Dec 2000
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From: Central PA
Thanks guys. When I say NOS I mean it looks like what was stock. I don't know when it was made. It could have been a replacement part.
I did have it apart and the diaphragm looks good. I did pour gas in the sieve by removing the glass top. I will pour gas in the inlet and outlet holes and try again.
Will keep you posted.
I did have it apart and the diaphragm looks good. I did pour gas in the sieve by removing the glass top. I will pour gas in the inlet and outlet holes and try again.
Will keep you posted.
New User
Joined: Jun 2010
Posts: 22
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From: McLean, VA, USA
I put a little 'fogging' mix together 50/50 oil/gas in a spray bottle pumped a few squirts in both the inlet and outlet ports of the pump. then I filled the uphill line and carb prior to starting the motor. I'd also blown out the lines from the tank outfall to the carb (replaced the rubber sections). My pump had been dry for years, but came to life and is working today. 
Good luck, hope it works for you Abe.
Good luck, hope it works for you Abe.
Thread Starter
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Fleet Owner
Joined: Dec 2000
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From: Central PA
Will try priming the pump in the next couple days and let you all know my progress...
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Posting Guru
Joined: Jul 2007
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From: I live in Leitchfield, KY
You know, I have thought of cam lobe wear. I started a thread this past winter about oil companies not putting zinc in motor oil anymore and cams have been wearing faster than normal, so I have thought about maybe the lobe for the fuel pump is worn. But would it wear so bad that the pump would stop working completely all at once??
Will try priming the pump in the next couple days and let you all know my progress...
Will try priming the pump in the next couple days and let you all know my progress...
Hey abe, not to 
steal the thread, but did you ever get the samples of material that I sent you? And did it suit you? Let me know dude.Thanks
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Hotshot
Joined: Oct 2009
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From: Burbank, WA
Just so we're clear and we all understand what certain automotive terms mean, "NOS" means "New, Old Stock" which is a term to describe original equipment manufacturer (OEM) parts procured from the dealer that have never been used on a vehicle. Many times they are still in the original box, and typically they have been long obsolete, but neither of these things are necessary to be considered NOS. So for our purposes in this story, an NOS fuel pump would be an unused original Ford part sitting on a shelf for 50 years. Any aftermarket replacement is not considered to be NOS.
Posting Guru
Joined: Mar 2008
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abe, i find it hard to believe lobe would puke instantly, but have seen stranger things happen. usually, pump rod would wear off at ends, gradually, causing weak pump pressure. just figured, if pump is off, why not check movement to eliminate guesswork. did you blow through fuel line from engine back into tank? sometimes a little crud will settle in exit port of tank, blocking fuel flow. remove cap, you should be able to hear gas (bubble) as air is applied. if you use a rubber hose and blow thru to tank, you will be able to feel if there are any restrictions. DON'T inhale.
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Fleet Owner
Joined: Dec 2000
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From: Central PA
Yes I go the samples Sorry, I thought I sent you a message. They look nice, not sure which I like best. I have put the seat on the back burner for now as I got to get the truck running first.
Thanks, Abe
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Fleet Owner
Joined: Dec 2000
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From: Central PA
52 Merc, I misspoke when I said it was NOS. It is not in a Ford box. It is a replacement part but looks just like the original. The point I was making was I do not know how old it is.
Petey Shoes, the arm is attached to the pump not the cam so when the pump is off I can not see the arm move up and down. The arm doesn't look worn on the old one and of course the arm is new on the other one. I find it hard to believe that the cam would go all at once, also. Tonight I did blow into the gas line toward the tank and it did not blow hard and I heard a lot of bubble action.
I never thought of a carb problem, but with this new old style pump... it has a glass bowl. Wouldn't I see gas in the bowl?
Thanks for all your help boys. I will stay in touch.
Petey Shoes, the arm is attached to the pump not the cam so when the pump is off I can not see the arm move up and down. The arm doesn't look worn on the old one and of course the arm is new on the other one. I find it hard to believe that the cam would go all at once, also. Tonight I did blow into the gas line toward the tank and it did not blow hard and I heard a lot of bubble action.
I never thought of a carb problem, but with this new old style pump... it has a glass bowl. Wouldn't I see gas in the bowl?
Thanks for all your help boys. I will stay in touch.
Posting Guru
Joined: Mar 2008
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had my mind in flathead territory, my mistake. yes, there should be gas in the bowl. perhaps ross is right in saying diaghram is dry and or checked. i had similar problem with my pump, changed diaghram, end of issue. i would also open up pump and see that screen/strainer is not corroded. sometimes, when these pumps sit for extended time, condensation will accumulate on screen and plug it up. if glass bowl has cork gasket, this could be dry and allowing air to be pulled instead of gas.
Thread Starter
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Fleet Owner
Joined: Dec 2000
Posts: 25,405
Likes: 5,411
From: Central PA
had my mind in flathead territory, my mistake. yes, there should be gas in the bowl. perhaps ross is right in saying diaghram is dry and or checked. i had similar problem with my pump, changed diaghram, end of issue. i would also open up pump and see that screen/strainer is not corroded. sometimes, when these pumps sit for extended time, condensation will accumulate on screen and plug it up. if glass bowl has cork gasket, this could be dry and allowing air to be pulled instead of gas.