307 Olds fuel pump install

[kustomkyle]

Seems like a really dumb question, but what exactly are the steps to reinstall a replacement mechanical fuel pump back into an Olds 307?

This isn't exactly rocket science. Except of course when it's a smog era Olds with A/C, air pump, and bracketry in the way. I cannot get the lever into the hole in the block far enough to even remotely get the bottom bolt started.

It's the correct replacement pump. The only issue I can think of is that I'm not getting just the right angle on things because of lack of maneuverability.

Any incite into how anyone else has gone about this would be greatly appreciated. This should be very simple.

 

[565bbchevy]

Seems like a really dumb question, but what exactly are the steps to reinstall a replacement mechanical fuel pump back into an Olds 307?

This isn't exactly rocket science. Except of course when it's a smog era Olds with A/C, air pump, and bracketry in the way. I cannot get the lever into the hole in the block far enough to even remotely get the bottom bolt started.

It's the correct replacement pump. The only issue I can think of is that I'm not getting just the right angle on things because of lack of maneuverability.

Any incite into how anyone else has gone about this would be greatly appreciated. This should be very simple.

I would rotate the engine and try again until it goes in, it is probably pushing on the lever where it is now.

 

[kustomkyle]

I would rotate the engine and try again until it goes in, it is probably pushing on the lever where it is now.

Tried that too. I was leary of doing that, because it really didn't seem like it would make much difference. And, so far, it hasn't.

Just looking to see what everyone else has done. On a larger car, or older car, or with an engine out of the car this wouldn't be a problem.

 

[ck80]

This is also going to sound like a dumb question, but, have you compared the lever arms?

Same era, different engine, I had an 87 cutlass that was Canadian built, but a 231 v6. The lever arm on the fuel pump was a different size than what a couple parts stores kept sending out. Turns out, apparently, there were different length arms sometimes for the same engine block?

Didn't make sense to me until I compared things side by side.

If everything looks right, have you tried pushing it down to see if it's expecting the lever to be partly compressed when sealed against the block?

Had one engine it needed to be manhandled into place on - should be simple right? If it's the right pump and you rotate the engine slightly it should slip on? Well, unfortunately I've had a handful of experiences now and then where it just didn't seem that way

 

[kustomkyle]

This is also going to sound like a dumb question, but, have you compared the lever arms?

Same era, different engine, I had an 87 cutlass that was Canadian built, but a 231 v6. The lever arm on the fuel pump was a different size than what a couple parts stores kept sending out. Turns out, apparently, there were different length arms sometimes for the same engine block?

Didn't make sense to me until I compared things side by side.

If everything looks right, have you tried pushing it down to see if it's expecting the lever to be partly compressed when sealed against the block?

Had one engine it needed to be manhandled into place on - should be simple right? If it's the right pump and you rotate the engine slightly it should slip on? Well, unfortunately I've had a handful of experiences now and then where it just didn't seem that way

Everything checked out appearance wise.

I did replace the main feed steel fuel line from the pump to the carburetor a few years ago with one from Inline Tube. That also proved WAY more difficult than it should have been. Too many bends and not enough slack, no room for error when it's being manufactured. The fix for that would just be to put a barb in the pump and another in the carb, then use rubber in between. But I'm not a fan of rubber hose for fuel.

 

[olds307 and 403]

You are trying to install it with lines up, correct? The eccentric is completely round, unlike a sbc, the position is the same.

 

[sldwys]

I just did this a few weeks back. Here’s some info from another member that helped me.

heres my thread. Read through my mistakes and hope you get it. Lol.

Replacing 307 Water Pump

I ordered from GM parts giant. 6472172 is the part number. For some reason it’s showing discontinued now on their site. Apparently you got the last one they could get then. That is the VIN 9 pump for 85 442. You're good on that part. Just as long as you installed it correctly on the cam.

gbodyforum.com

Also sniped a pic from classic olds that helped me visualize it.

https://gbodyforum.com/threads/replacing-307-water-pump.80172/page-4#post-819029

 

[kustomkyle]

You are trying to install it with lines up, correct? The eccentric is completely round, unlike a sbc, the position is the same.

Yes, there it's really impossible to get it upside down.

Seems so incredibly stupid to ask this question, but there's just something really weird going on. Or I haven't wrapped my mind around how or why I would need to remove the secondary air injection pump to get the fuel pump in a slightly different position.

 

[kustomkyle]

I just did this a few weeks back. Here’s some info from another member that helped me.

heres my thread. Read through my mistakes and hope you get it. Lol.

Replacing 307 Water Pump

I ordered from GM parts giant. 6472172 is the part number. For some reason it’s showing discontinued now on their site. Apparently you got the last one they could get then. That is the VIN 9 pump for 85 442. You're good on that part. Just as long as you installed it correctly on the cam.

gbodyforum.com

Also sniped a pic from classic olds that helped me visualize it.

View attachment 167497 https://gbodyforum.com/threads/replacing-307-water-pump.80172/page-4#post-819029

Yes, that's a good visualization of what I'm blindly trying to do with the pump.

I guess maybe I need to get an inspection camera to see what the major malfunction is. And to think, this should be a 30 minute job, start to finish...

 

[olds307 and 403]

Maybe loosen the bracket slightly. Can you get in to the point where you can get the nut on the stud?