Grrrrr..ive got them again...replaced pump a few(2007) years ago...had a heckuva time getting a decent one...I got one and life was good blah blah blah...fast forward to present day...I ran the beast outta gas...pulled up bunch of crap...replaced filter, blew lines out and so forth...nothing got past the pump...carb line is clean as a whistle...I put a fuel pressure gauge on it...fat green band at beginning of scale before it goes into the numbers of psi...it just sways within the lil green band...kinda like amp gauge goes at times...and moves about as much...I swapped it out with a used OE one off of a running rig..buts been dry for a year...clean filter and so on...do pump pressure test on it...same result...book says these pups should suck at 4.5-6.5 pounds...Any idea why two pumps would produce same result ??? truck ran fine until it ran outta gas...I put 2 inline filters before the pump...one right at tank under cab floor and other up front between frame rail line and fuel pump inlet.
Its got an FE in it...have any of you ever heard of the fuel pump eccentric going bad ?? No weird noises etc in it before it ran out...just normal as pie...
I tried bottle feeding it at pump inlet and it wont even put anything in the filter can let alone get the filter wet let alone damp..When I dump gas in the carb it runs fine as always...
Im not gonna put electric on it...most of you know by now im a purist so its gonna be getting/keeping a Carter pump on it....Im just wondering about the cam eccentric aspect...



- cs65

 

What is the total number of filters that the pump has to suck through?
And are the filters big ones
Is the crud in tank hard maybe putting holes in diaphragm ?

 

i'm not sure what you mean by the green bands on the gauge.

maybe the pickup and/or sock in the tank is plugged?
if i was having that much trouble with trash in the tank, i'd just get it boiled, seal it, and be done with it.

 

The green band im referring to is on my fuel system pressure gauge...a tool to check for pressures...its also a vacuum gauge...
As to the blockage...there is none...the filters are about the size of the oil pressure gauge sending unit...see thru plastic ones...I can blow into the tank backwards just fine all day long before the filter comes into play...and yes the filters are installed the right direction...arrow pointing to the carb is pretty self explanatory...im beyond mad at this point as you can tell...i am just wondering about the fuel pump eccentric on the cam gear if anyones had problems with this in the past...


- cs65

 

maybe both pumps have bad diaphragms?

put the OE pump back on the running rig and check the pressure there.
that'll at least tell you whether the 2nd pump is bad as well.

 

Do you have the old pump or one to trash
Maybe cut out back half so you can see it pump or rig up something to measure action of cam
Don't want it to be the cam if it is put fake pump and hide elect one

 

No sock (filter screen) is used with an in-cab fuel tank, because the fuel sending unit does not contain the pickup tube (see parts catalog pic).

D1AZ-9A011-A .. 3/8" I.D. Plastic Meshed Filter Screen, located on end of fuel sending unit pickup tube.

1957/79 all FoMoCo vehicles except 1957/77 F100/750's with in-cab fuel tank, except Maverick/Comet/Pinto/Bobcat that use D1FZ-9A011-A 5/16" I.D. filter screen.
The fuel pump you installed, is it like the original with the canister that threads on and contains C4AZ-9365-B .. Corrogated Paper Cartridge Filter (Motorcraft FG-1A)?

240/300/352: This was the only fuel filter these trucks came with originally. Inline filters were usually installed because people were unaware that the fuel pump contained the filter.

C3AZ-6287-A (replaced B8A-6287-A) .. Camshaft Fuel Pump Drive Eccentric / 1958/73 all FE engines / 1974/76 360/390 have 2, inner & outer.

 

Id have to say it would be very rare for an eccentric to actually go bad.

You dont want to use an electric, which I dont blame you for. But for testing purposes, I think hooking up an electric might not be the worst idea. If it runs with the electric, I would replace the entire pump and go from there.

 

Hi Don I didn't see in the posts that you have checked visually to see that the pump is actually pumping gas the the carb. Disconnect the fuel line at carb and crank the motor over with line running into a can or some such to hold the pumped fuel. Im guessing you tried this but didn't see where you had. It just sounds like you are trying to pump to the carb through a pressure gauge. I had a hell of a problem with my 66 back in the day with the fuel tank. Somewhere down the line a larg bumble bee had gotten into my tank. Most of the critter had desolved except for the back half. It kept floating around in the tank and occasionally plugging up the pick up tube. I finally had to remove the tank and empty it by pouring the gas out of the fill neck. Amazing what was found in that tank. No more problems after that. Good luck with yours. I feel your pain

 

My suggestion is to take a hose from the suction of the pump to a can of gasoline. Take a hose from the discharge to another can and do a volume check and pinch off the suction hose to test the vacume/fuel pump and gage.

In regards to the gas tank, Buzz44's foreign objects reminded me that my dad was a mechanic and a guy brought in a pickup with recurring fuel problems, my dad took the tank out and found a handful of small pieces of cut up inner tube, clean gravel and (of all things and no kidding...) a zippo cigarette lighter. I am guessing someone was giveing the guy a message.

Made any enemies lately?

 

locking gas cap, man...locking gas cap.