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Old 08/12/18, 02:08 PM   #1
Tony Mele
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Wink Mechanical fuel pump replacement suggestions

Well it seems that my mechanical fuel pump is failing. I've got a clear filter just before the carb and it's barely getting any fuel in it at all. Engine is starving for fuel especially at highway speeds. The filter gets little dribbles of fuel.

Do I go with an off-the-shelf stock 302 fuel pump? Or does anybody on here have a different recommendation?

Thanks

1973 Bronco Sport 302, Holley 650, dual dynomax exh, MSD elec. ign., 3" lift/33"s, original harness, auto/PB front disc/ PS
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Old 08/12/18, 04:39 PM   #2
spap
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There are a couple of ways you can go but why not just go the original mech. Fuel pump is
Easy and cheap and works
Saves money in case it is some thing else like a clogged fuel line or the sock on the tank pick up is clogged.

77 5.0 4R70W 3.5 sl 1bl PS pb 35 mt
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Old 08/12/18, 07:08 PM   #3
blubuckaroo
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Always troubleshoot before replacing parts. Otherwise you'll just be chasing your tail and possibly loosing better quality parts in the process.

It's really pretty easy to check the system to isolate the problem.
Disconnect the suction hose from the fuel pump and point it into a can, bottle, or jug. Take your air hose and a rag to seal it, and sort of pressurize the tank from the filler neck. If everything is clear, you should get a good stream of fuel into your catch-can. If it's not clear, you won't.
Also, if there's a leak in the suction line (between the tank and pump) it'll be obvious now. You'll see fuel squirting out of the leak.

If all this checks out, you should connect your vacuum gauge to the fuel pump. Most portable automotive vacuum gauges have a fuel pump scale just for this purpose.

This troubleshooting process may sound like a lot of bother, but it's worth the trouble. Good quality older parts will usually outperform the new junk parts.

'77 Ranger/cut F&R/PS/PB/Vintage Air/2" suspension lift/1" body lift/T tie rod conversion/33-1050-15 BFG K02 tires/ 302/ Edelbrock 500 CFM 4 bbl/Aero Tanks/ Hooker Headers/ dual ex/ NV3550/ B&M shifter/ JB FabTwin Sticks/ 4.11s/rear posi.
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Old 08/12/18, 07:51 PM   #4
bronconut73
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I tried Holley and Edelbrock mechanical fuel pumps. They only lasted a few years.
I bought a Carter mechanical fuel pump from Summit. Ran it for about 15 years, until recently in fact.

'73, 3.5" sl, XL RS9's, F-250 mounts, Duff Long Arms, 1" bl, 35" MTZ's, C-4, twin sticked, P.S., built 351W, F&R Detroits, 4.11's, chromo axles, 11 leaf packs, SuperJoints, Chevy front disc, BC rear disc, BC Vintage a/c, Scat Procar 2K seats, 3G, Alpine/Pioneer, Bear, Cobra 148 GTL/Texas Star.
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Old 08/12/18, 10:11 PM   #5
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That can also be a failing suction hose/line or even the selector valve under the seat is leaking air into the pump. Clogged suction screen in the tank, pinched fuel line, etc. I would start with changing the rubber suction hose and run it out of a gas can. Does it appear to pump good out of the can? Disconnect the line off the filter and put that into a catch can. Start the engine, it will run off the fuel bowl. I think it should pump a pint in 30 seconds or something like that. If it fails after all that, time for a new one.

Or if it is leaking onto the ground or into the crankcase it is time for a new one as well.

But you might just need a buck worth of new rubber hose instead of a new pump.

"She's built like a steakhouse but she handles like a bistro"-Zapp Brannigan
“How hard can it be?”-Clarksonius 4th century BC.
Full throttle, it either solves the problem or ends the suspense.
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Old 08/13/18, 01:02 PM   #6
Rustytruck
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Don't buy a Carter mechanical fuel pump the components inside are junk. My last one lasted 2 years. The Carter before that was well over 10 years. The replacement I just bought was Airtex hoping for better results.

I just tore the Carter apart and the suction valve was just horrible. The diaphragm looked good though. I'll try to post pictures if my old brain works later today.

1974, stock 302, C4, BFG KM2 33x12.5x15, 8in rim, detroit rear, trutrac front 4.11 gearing, Warflairs,2.5" lift, chevy disc conversion, Hydraboost, owned since Christmas Eve 1977
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Old 08/13/18, 01:57 PM   #7
savage
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Quote:
Originally Posted by Rustytruck View Post
Don't buy a Carter mechanical fuel pump the components inside are junk. My last one lasted 2 years. The Carter before that was well over 10 years. The replacement I just bought was Airtex hoping for better results.

I just tore the Carter apart and the suction valve was just horrible. The diaphragm looked good though. I'll try to post pictures if my old brain works later today.
I had trouble with the Carter pump, it lasted 2 months. Bought a Airtex and it's still running strong.

TAZ-74 bronco,302,c-4,dana20 and 3.5inch lift WILDHORSES
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Old 08/13/18, 02:18 PM   #8
Tony Mele
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Thanks everyone. I really do appreciate the perspective in the advice. I actually have done most of the troubleshooting suggested here already. Checked all of the lines and everything from the tank on up to the front end. Everything seems fine until I hit the fuel pump. Even that seems to be okay at idle. But the moment I increase the revs it begins to fail. I've got a clear fuel filter just before the carburetor and I can watch the thing literally go dry.

1973 Bronco Sport 302, Holley 650, dual dynomax exh, MSD elec. ign., 3" lift/33"s, original harness, auto/PB front disc/ PS
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Old 08/13/18, 03:08 PM   #9
ransil
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Could be sucking air.
Put a vacuim on it and see if you can draw fuel

Sent from my SM-G920V using Tapatalk
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Old 08/14/18, 08:35 AM   #10
Rustytruck
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Carter fuel pump valve pictures. This pump was 2 years old with less than 2000 miles on it. Made in China for Carter. The disassembled valve is on the suction side. The center hole in the valve is way oversize and with the spring off center pushing the disc over there was an open leak that didn't seal the valve and allowed the pump suction not to work. P.O.S Changed to an Airtex pump so we will see how that goes. Its made in China too.
Attached Images
File Type: jpg fuel pump1.jpg (23.5 KB, 15 views)
File Type: jpg fuel pump 2.jpg (26.4 KB, 13 views)
File Type: jpg fuel pump3.jpg (47.0 KB, 15 views)
File Type: jpg fuel pump 4.jpg (23.9 KB, 13 views)

1974, stock 302, C4, BFG KM2 33x12.5x15, 8in rim, detroit rear, trutrac front 4.11 gearing, Warflairs,2.5" lift, chevy disc conversion, Hydraboost, owned since Christmas Eve 1977
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