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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2003 Posts: 2,953 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 2,953 | Cleaned the old pump and put an additional in-line filter on the gas line and installed the pump. So I think. Put it in place and could finger tighten the bolts until they were seated. There was a bit of tension on the pump from the diaphram lever. Took forever to start and when it did there was a loud "whomp-whomp" sound from the engine.
I figure installing the pump is fairly simple but is it? Is it possible the lever is on the wrong side of the came lobe or is that impossible. Did one once before on a 216 and it was fine. This is a 235. | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | Sounds like the arm is on top of the cam lobe istead of under it.
The resistance you feel depends on the position of the cam. You a good light and an inspection mirror you may be able to see the lobe. It's a common error that nearly everyone has made I think. | | | | | Joined: Dec 2003 Posts: 2,953 'Bolter | | 'Bolter Joined: Dec 2003 Posts: 2,953 | If it was installed the wrong way would it not run? The lever only pumps one way. | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | There may be just enough action to pump a small amount. At least that is my thinking. Did you pull it off and check it? | | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | OK, now you boys are confusing me. The pump lever rides on top of the concentric doesn't it? If pumps on the downward stroke of the diaphragm which equates to an upward push on the lever. You couldn't get an upward push with the lever under the cam. Or is my ancient gray matter failing me again. 
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| | | | | Joined: Mar 2011 Posts: 15 New Guy | | New Guy Joined: Mar 2011 Posts: 15 | look at the pump arm there should be a flat spot on it for the cam vto ride on. if it is on top of the arm, it goes under the cam if on the bottom it goes on top. at least thats my way of thinking.
really like the stovebolt site. not the sharpest file in the drawer when it comes to computors. better at rebuilding parts. hope im in thanks guys rodC66
| | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | I've put three pumps on my 216 and they all went on top of the cam. Me thinks it's just a typo.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
| | | | | Joined: Dec 2008 Posts: 319 Shop Shark | | Shop Shark Joined: Dec 2008 Posts: 319 | I thought I'd gotten 2 bad pumps in a row from FLAPS for my 250. Then I happened to find a picture in the Chilton's book showing the fittings on top of the pump, instead of on the bottom like a V-8. Oops! I'd been installing it upside-down.
Don't know about the older 6's...
cm
If you can't fix it with a hammer and screwdriver, you need a bigger hammer.1965 Chevy C10 | | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Oops! I'd been installing it upside-down.
Don't know about the older 6's...
cm Yeppers, they go with the fittings on the top.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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