Dual action pump line locations???

[SteveKfl]

Can anyone help me try to help a neighbor.  He is a retired doctor that inherited his dad's 49 Jeepster, not running.  It appears to have had some questionable "experts" working on it.  The dual action pump, pic attached, seems hooked up wrong to me, with vacuum lines on bottom and fuel on top.  Is that correct?  The new carb isn't getting any fuel.  Any identification of line locations routing of pump would be helpful.  Thanks!

[PercyUK]

Hi, yes that's fine. Take the hose leading to the carb off, prior to the round device which is a pressure regulator and give it a crank. If there is fuel then try bypassing the regulator and have another go. If no fuel take the line off that feeds the pump and check for fuel. If you have fuel the pump is duff, no fuel then check the lines from the tank and any filters. Whilst your at it smell the oil dip stick. If you can smell fuel in the oil then the pump diaphragm may be split requiring a rebuild.
Good luck.

[SteveKfl]

Thanks Percy.  The battery was dead when I got there, so no turn over capability.  Just looking at the riggin, it is all weird and bubba'd.  I came home to do some research and found conflicting info on whether the top half of pump is fuel, or vacuum.  That is what I'm trying to verify now, so when I go back to a charged battery, I can move on to isolation checking points for fuel flow.  If it is hooked up wrong end of pump, I don't want to run more fuel thru it incorrectly.  I also don't understand why a mechanical pump for steady vacuum, would be hooked to the intake manifold vacuum as a "vacuum source"  How would that steady the wiper action???  Obviously, I have no dual pump experience.  BTW, no gas smell in the oil when checked first thing.

[scoutpilot]

Both the pump and the lines are correctly oriented.

Questions;

Is there a spacer between the pump and the block?

Why is there a pressure regulator installed in the first place?

Rubber lines attached to straight steel tube with only one clamp will suck air. Not maybe, but will. Either go with all metal, the preferred option, or go all rubber with barbed fitting and the proper solid metal clamps that completely surround the tube.

[SteveKfl]

Scottpilot, thanks for your response.  Interesting you say it is oriented correctly, as I just found a pic of a Jeepster with the top vacuum lines blocked off with bolts, 1st pic attached.  It isn't mine so I don't know much detail other than looking at it yesterday, so I don't know about the spacer.  I'll check for that next visit.  The rubber to copper is only the beginning of poor installation that I see, including the PVC installed between the intake and pump line, and that copper line fitting is even crossed threaded at an obvious angle of unmatched threads.  There's a "creative effort" of a ball bearing visible in a compression fitting used to cap off a multi-adapter for the PVC and something else at the intake manifold port.  If... the owner wants to change anything, I'll certainly try to persuade him to go with metal lines and proper fittings, but that is up to him.  The 2nd pic is what got me confused.  I thought the larger bowl size on the bottom was also an indication of the fuel end of the pump, but I guess I'm wrong.  Thanks for sharing your expertise. 

[Rus Curtis]

Percy's right.  The top is the fuel pump.  The bottom is the vacuum "boost" that assists the manifold during acceleration.  You can also test that with just your fingers: crank and feel for suction on one and pressure on the other.

Depending on the age, I'd also suspect the diaphragm but following Percy's line of thinking and Scoutpilot's input, go one link at a time to see where the flow stops.

I've always thought the plumbing on a flat head was neater since everything is on the driver's side.  Plenty of images but it takes time to sift through looking for what you need.

Section B has info on pump:
https://cj3a.info/lit/owner/Owner.html

Images of lines running to/from pump (specifically showing fuel part on top):
https://cj3a.info/tech/line.html

Caprio's 3A showing all the lines (notice vacuum lines clipped together and running down below fuel lines - showing vacuum on bottom of pump):
https://cj3b.info/Photos/Siblings/CJ3A/Caprio/Lagler/3AEngineLeft.JPG

Added:  Steve, after your last post (I was still typing) I'll say I don't know much at all about jeepsters.  I've not seen a pump like that, but I'm making an assumption that jeep engines shouldn't be too different within a given year.  Testing as noted above should ID the pump vs. the vacuum sides of the pump.

[SteveKfl]

Thank you all, Rus, Scott, and Percy for your time and input.  I feel comfortable now with the set up locations.  Better safe than sorry, IMO.  Fitting conditions and Tubes, not so comfortable, but that's his decision to make.  I will pass on the link for engine info for reference, very useful in the future.  Rus, you are a master at searches.  I couldn't find anything but the CJ2A hose routing pic on my own.  The expertise and willingness to help from this site is why I love being a part of it.  Thanks to all!

[scoutpilot]

I know this sound trite but the simple question to pose to the owner is "Do you want it to run right for a long time?"

[SteveKfl]

I don't think it is "trite", but I also don't think the owner is beyond just getting it running at this point.  He has self-proclaimed "no mechanical skills", and just wants his dad's old car running again.  He is retired himself now, so I'm not sure what "long time plans" he has for it.  I just was asked by a third party if I could try to help him get it started.  Now, we all have helped get him going in the right direction, hopefully.  Thanks for your input.

[PercyUK]

Let us know how you get on. Good luck.

[SteveKfl]

Thanks.  Will do if he calls me back to continue.