My '47 has been leaking oil out of the fuel pump stand gasket. I've taken the stand off before to replace the gasket only to find the stand is slightly bent up, I straightened it out and replaced the gasket. It's leaking again and this would be the 3 time it's bent the stand (I haven't taken it off yet but I'm betting it's bent again). I think I used 2 gaskets last time for extra height. Before I pull it off, measure everything and make a spacer.....is this normal??. I've read older posts by Bruce stating that there was only 2 push rods and they were 1" apart in size, if I was 1" off I think it would break something or not pump. It bends it up just enough to leak a little while driving and you have to put in on a flat surface to see it once it's off. I'm trying to remember what I have on there, but it's either a stock fuel pump stand or one from San Francisco Flatheads.
Do you have a PCV system other than the road draft tube? I say it because my flathead leaked everywhere until I installed a vacuum operated ventilation system and relieved the pressure in the block.
Is it a newly rebuilt flathead?????? A new or different intake manifold?? Is it a stock or aftermarket fuel pump stand?? Is your rod fitting down into the hole correctly. If so measure the length of the rod from the pump seat to the top of the rod. Then measure from your stand to the fuel pump actuating arm. Also I didn’t know this but I’ve read there are actually two different stock pumps on the early vs the late flatheads. more hamb info on these fitment issues. https://www.google.com/search?q=fls...iAwQYASBBiAYBkAYE&sclient=mobile-gws-wiz-serp
Prob not this but if you mix up the order of the stand gasket,stand and baffle tube it can leak and bend the ears.
Maybe the ears are weak from having been bent and then straightened? Might never stay straight again.
It's an old motor and the car is hardly driven. I bought the car in 07, I remember changing the stand because the threads on the old one where stripped (when I replaced the fuel pump in 2010 or so). I got the new part from SF Flatheads and just put it on. I don't remember having that problem previously and it took about a year to start leaking (again little use). Knowing my paranoia I bought 2 stands at the same time, I'll look in the new parts bedroom . I'll have to revisit it when I replace the electric fan with the stock fan and look into what @Sart156 said. Thanks all
Do you have the baffle with the stand? It can be hard to line the baffle, pump stand, and gasket up. If the baffle slips out of the recess and you torque the stand down I could see it warping it.
Before I install one of these used stands, I scrub the gasket surface on a sheet of 80 grit sand paper laid on a surface plate (in this case, my cast iron table saw). That will make a good gasket contact. Another thing, the are several lengths of fuel pump push rods. There are lists that show the lengths out there and can be found at some of the parts vendors. Do not add or subtract gaskets or anything else that changes the stroke of the pump. Too short and you'll not get as much gas. Too long and it will break something. Another thought: what cam do you have in it? Stock? Race grind? Re-grind? The lobe that runs the rod up and down could possibly be a problem on a racing cam, or re-grind. I'll get you a parts number for the correct rod. You may have a faulty stand. Over tightening these stands will bend them every time, too.
As far as I know it's bone stock converted to 12v alt. Here's when I had the engine out a few years ago, I think I had replaced the stand about a year prior. I'll look at it again probably next weekend, as I got the Drake fan hub to put on. I honestly can't remember what if any order I put the stand on. Like I said it just SLIGHTLY lifts the center of the stand just enough to dribble out as I drive.
Billy, Do you have any pics of your PCV set up? I have a blown Flathead in my Hot Rod and it leaks out of the oil fill tube on a long run. I put a breather on top and an oil catch can, but no success. The side of the car was covered in oil after a 150 mile run. So maybe a PCV?
Better than that I have a thread on it Technical - BLOWN FLATHEAD PCV QUESTION (RETROFIT) | The H.A.M.B. (jalopyjournal.com) I tapped the vacuum from the carb adapter above the blower and stuck the PVC in the intake manifold where the road draft tube was. The result was instantaneous, no more leaks, smells and it runs better.
The engine isn’t hitting the firewall under load is it? I had a model A I built that used to flex and snap the fuel pump stand like when doing donuts and stuff haha. Ended up dimpling the firewall to fix it. May be as simple as the pushrod being too long for your intake height. Good luck
subscribed because my pump rods are all mixed up in a box and i have a few stands with bent ears as well
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