Fuel pump rod question

jbowse2 · Posted: Sun Oct 04, 2009 8:00 pm Post subject: Fuel pump rod question

OK, Long story. Bought a 74 Super for my daughter to drive, leaked oil like nothing else out of the rear main seal, removed engine and replaced gaskets and seals, did not open the case, but did install an oil pump/oil filter combo. Finally got it back together after a year of get-a-round-too-it, fuel pump was shooting fuel everywhere.

I did replace the fuel pump spacer due to being broken off at the bottom when I had the engine out. New spacer slightly (1/16" or so) shorter than the original. I did measure the pump rod stroke, and adjusted as necessary with gaskets as per Bentley.

Went for a test drive with the new pump, came back and had oil all over the engine compartment, looked and saw the fuel pump spacer broken where it faces the alternator mount. Disassembled and found this

Image may have been reduced in size. Click image to view fullscreen.

this is a picture of the new fuel pump installed with out the broken spacer

this is the old fuel pump on the left, had to disassemble it for removal due to not wanting to remove alternator. The original fuel pump spacer is also shown with the broken tip, is it reusable?

these are the books I have to guide me in making this car run

My Questions
What caused the pump rod to bend?
How do I get the broken chunks of the spacer out of the engine?
Did I screw up something by having this happen?
Do I dare try and straighten the rod or am I better off replacing it?

Thanks in advance, Jim

fastinradford · Posted: Sun Oct 04, 2009 8:07 pm Post subject:

I don't think you can just not run a spacer, there is not enough travel and it is bending the fuel pump pushrod, it is still pumping fuel and driving because it is bending the fuel rod until it WILL work, but it will not work for long, the flange guides the fuel pump pushrod.

are you running a pacer or not, your post is difficult to interpret. when you changed fuel pump and spacer types, did you change fuel pump pushrods? there are two different lengths.

jbowse2 · Posted: Sun Oct 04, 2009 8:15 pm Post subject:

I just have the pump sitting there right now with out the spacer, waiting for parts. I did not know there were two different lengths for the fuel pump rod. Could that make a difference with the new/different design fuel pump?

fastinradford · Posted: Sun Oct 04, 2009 8:31 pm Post subject:

there are fuel pump rods for alternator and generator cases. They are not expensive, like $1 used. I would buy 2 new ones (one of each kind), and a new spacer fuel pump flange, see which one is NOT the size you were using before, and try that one.

no 100% chance of success, but it's worth a shot and not too expensive. Search the classifieds. there are all the parts you are looking for use at a very fair price. in my opinion.

Yellowbeard · Posted: Mon Oct 05, 2009 5:22 am Post subject:

You were using a long pushrod with a short pushrod-style fuel pump. It'll bend the pushrod/break the spacer every time. And usually kill the new pump. Your old pump was shooting fuel all over because the outlet fitting pulled out of the housing. It appears to be an American-made 40hp-style replacement. They're bad for this.
Replace your spacer and get the correct pushrod for whichever pump you choose to run. Buy a quality pump. I know a guy who sells 'em... Wink

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runamoc · Posted: Mon Oct 05, 2009 6:18 am Post subject:

Yellowbeard · Posted: Mon Oct 05, 2009 6:37 am Post subject:

runamoc · Posted: Mon Oct 05, 2009 8:56 am Post subject:

Yellowbeard · Posted: Mon Oct 05, 2009 9:09 am Post subject:

gimpy60 · Posted: Mon Oct 05, 2009 1:13 pm Post subject:

generator pump stands straight up//////long rod (4 1/4") alternator pump leans over to miss alt/////////short rod (3 15/15") simple. Gen. application needs 13 mm. from spacer,,,alt will be around 7mm. sticking up . these measurements are taken at full lift.........these parts ARE NOT INTERCHANGEABLE.
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How the hell ya spost ta fix it, ya don't even know how it works boy

ashman40 · Posted: Mon Oct 05, 2009 4:19 pm Post subject:

jbowse2 · Posted: Mon Oct 05, 2009 6:59 pm Post subject:

Thanks for the info, I will check my fuel pump for destruction and find me a new push rod and spacer.

Is there a good way to get the broken pieces of the old spacer out of the engine?

Yellowbeard · Posted: Mon Oct 05, 2009 7:46 pm Post subject:


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