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Old 01/14/18, 11:16 AM   #16
oldiron
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Are you 100% certain you don't have a 351? Firing order.
Greg

'72 Wagon 302/3spd Seapine Green Poly
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Old 01/14/18, 12:17 PM   #17
broncnaz
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could be possible that the dowel pin for the eccentric has sheared off possible due to cam gear bolt loosening. which is allowing the eccentric to kinda spin free and not operate the fuel pump correctly. Definetly a good idea to pull that timing cover kinda sucks but its better than having a the cam gear come off at a bad time.

73 Ranger 2 1/2 lift 302 TFS heads NP435,PS,PDB, tierod over, 33x10.50x15 BFG M/T
71 Sport 63,000 miles all orginal except for cut fenders 302 3sp 4.11's D44/BBTrac lok rear
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Old 01/17/18, 08:35 PM   #18
Shulaps
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Pulled my pump out and ran it by hand and it pulls gas no problem. Similar issue as with the last pump. Debating just going electric but it would be interesting to figure out the issue. AMAX did you ever rip into yours?

'74 Bronco Sport
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Old 01/18/18, 12:50 PM   #19
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Yeah, it would be very good to find out why.
Especially important if that "why" is that the cam bolt is loose. Even with the cover to keep it inside the engine, it would likely not be a good thing to have it all bouncing around in there!
The good news is that if the timing gear started bouncing around, your engine wouldn't run long after that. Less physical damage that way...

If it was a later engine and the fuel pump had never worked, I'd be tempted to say that someone retrofitted the older front cover and forgot to install an eccentric. But with intermittent pumping and the older engine, that seems unlikely.
Best to keep up the detective work.

Paul

'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"

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Old 01/19/18, 01:00 AM   #20
Shulaps
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Well pulled it apart and the eccentric looks fine? Has the 2 piece style. Not sure why the pump would not go full stroke and pump fuel properly? Are the Holley pumps adjustable where the arm starts to engage the pump? Any other thoughts? Hmmm, oh well. Guess I get to paint up the oil pan nice now!

'74 Bronco Sport
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Old 01/19/18, 01:01 PM   #21
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So it's locked down tight and the little bent tang is in it's hole then? No way for the eccentric to turn on the bolt? Hmm, strange.
Or am I thinking about Chevy cams and ours use a locating dowel?
Maybe it's coming down to the crappy quality assurance that lets them have a little too much leeway with original dimensions when making the new Chinese pumps?
But that wouldn't explain why the old one was doing the same thing.

Paul

'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"

www.wildhorses4x4.com
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Old 01/21/18, 02:57 PM   #22
Shulaps
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I think the eccentric was installed a little off. Maybe with the pump held up when installing it may give me a full stroke on the pump. Cleaning up and doing some painting so I will see if it corrects the problem I a few days.

'74 Bronco Sport
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Old 01/21/18, 03:07 PM   #23
langester
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The eccentric should have a dowel pin. There are two different pins on long and one short. Make sure you have the right one for your application. If the pin is too short the eccentric will not stay where it is supposed to.
Good luck and keep us posted!
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Old 01/21/18, 03:43 PM   #24
amax
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I tore mine down and the pin had slid back in and the bolt holding it in place was loose. It didn’t have much movement but I think it was just enough to keep it from actually pumping fuel. Putting it all back together today after painting all the parts before installing.
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Old 01/22/18, 04:51 PM   #25
Shulaps
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AMAX was yours a 1 piece eccentric? Mine was the 2 piece with the bent little tab instead of the pin. I am wondering if mine originally came with the 1 piece and the 2 piece was added after a rebuild. I wonder if there is a difference in stroke between the 2? I have read a bunch on these things and have yet noticed if there is and difference from one to the other.

'74 Bronco Sport
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Old 01/22/18, 05:28 PM   #26
DirtDonk
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I'd be surprised if the two types had different offsets. But I shouldn't be surprised at anything any more!

The 1-piece design was typically relegated to the heavy-duty applications, such as cop cars and ambulances, but could have found their way in to truck engines. In fact at one time I thought they were automatically included in truck engines.
But I believe that was incorrect, and that most of the standard light-duty vehicles (which ours would usually qualify as) would get the 2-piece.

Maybe someone knows if Broncos got one or the other, but I'd still say the offset is the same since it had to run the same fuel pumps for the most part. I think even Ford would have recognized the trouble it would have caused during future maintenance if they'd been different.
Then again...

Paul

'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"

www.wildhorses4x4.com
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Old 01/22/18, 08:55 PM   #27
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Mine was a 1 piece. My engine is not the stock 302 so there is no telling what the truck actually came with. The motor had been swapped out before I bought it. It ran good and still does just has to have fuel for that to happen
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Old 01/22/18, 09:16 PM   #28
gr8scott
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Great Scott!!

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I had to replace my 2 piece with a 1 piece when I changed out my cam.

'74 U152 | 302 | C4 | D20 Twin Sticks | PS | Front discs + Hydro | MSD 8352/6A | Centech Wiring | 3G 130A | Detroit Lockers
Edelbrock AVS2 | TFS Twisted Wedge |3.5" SL | 31x10.5x15 Dick Cepek MT's | US Wheel Indy Slots
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Old 02/14/18, 02:45 PM   #29
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Well quick update, I put everything back together and no luck. Since there is no adjustment I decided to bend the pump arm until I got some action. Didn’t take too much but definitely had to modify the arm. Only thing that I can think of is maybe whoever rebuilt the engine just grabbed what ever eccentric was laying around and put it in? All is good now and it pumps from dry no problem.

'74 Bronco Sport
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