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Zel's Motoring Adventures...Jag, Citroens, Mercedes & AC Model 70 - 24/02 - BX Fuel Pump Replaced...


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20 minutes ago, vulgalour said:

Excellent news on the fault hunting on the BX.  Perhaps with a stronger pump there's no need for a spring with the ball bearing and that's why there isn't one there?

Nope...had about 60psi on there to see if I could blow any crud out, it seals very well! 

Plus it would need a spring to seat it against the inlet port as gravity will cause the ball to drop away from the inlet port otherwise so it wouldn't work as intended.  If the ball does live there there definitely should be a spring there I reckon.

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1 hour ago, dollywobbler said:

Willing to bet that the fuel gauge is a duff earth at the tank end. Seems common on Citroens of that era.

Earthing the lead on the sender should prove that the gauge is okay (not to the tank, obvs).

Last time I met this fault was on a 1965 Anglia Super... where there was no earth strap for the tank, thus no return for the sender.

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11 hours ago, vulgalour said:

When you put it like that it makes more sense of there being a missing spring, or something just generally Not Right.  Just the fun challenge of figuring out what that something is now.

The general consensus (and my own conclusion) seems to be that that ball belongs under the accelerator jet.

Which may well explain why it doesn't work too as it will just be pulling air in through the jet rather than fuel from the bowl.

There are only two balls in the carb...a detent for the choke lever and the check valve in the accelerator pump.  Given the latter doesn't work it seems a likely suspect.

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Okay...so that ball does not live under the accelerator jet.  With it in there it's not possible to get the jet to seat fully so it plainly lives elsewhere.  Except of course now it's stuck in the hole so I'll need to remove the carb so I can extract it.  *Sigh*

Isn't it fun when things don't match the diagrams?

Investigation of the non-functional hazard flasher warning light has proven 50% successful.

The switchgear actually comes apart really easily...two screws out then everything just unplugs from the base.

IMG_20210223_161756.thumb.jpg.8294faf4f29783282f1ec7077cd932b9.jpg

Replacing the bulb in the switch was half successful.  It has restored the illumination in the switch which comes on with the headlights...

IMG_20210223_170728.thumb.jpg.f4515a1ef7dd4795cd97fc3895b1668c.jpg

However still no life from it when the hazards are actually on.  Will need to come back to that.

Got halfway through pulling the dash out before I ran out of time.  You have to pull apart the whole cowling below the steering column to access the bottom two retaining screws annoyingly. 

Then I'll need to stock up on lamps... didn't realise quite how depleted my stock was.

I did try replacing the one for the speedometer (as that is readily accessible from above) sadly this had no effect, so looks like there's a power supply (or grounding) issue on the panel itself somewhere.  Sure that will be fun to trace...

 

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Very quick update from today.

Had quite a few errands I needed to run today, having failed to get TPA out yesterday because we were boxed in by school traffic (to be fair with how windy it was that wasn't maybe a bad thing) I made a point of taking her out today.

Not being able to go anywhere makes getting decent photos harder...

IMG_20210224_150046.thumb.jpg.3641e4a91492052c23c549f4cb3255cd.jpg

I did get a couple of test videos from the Akaso action camera - video is far better than my phone though the audio is diabolically poor.  So in future I'll see about using separate recordings and splicing them together in software afterwards.  Tests were done with the camera on the door and windscreen - I didn't do a test on the rear windscreen as it would have involved faffing around looking through the rear window to frame it.  I didn't want to give passers by the impression I was out to shoot video rather than it just being done while I was already out.  In theory you can connect to the camera wirelessly from your phone to use that as a live viewfinder but I've never managed to get that functionality working.

The downside of this video source...that the files are both several gigabytes in size...so they're not going to be uploaded anywhere today.  Tomorrow maybe.

This afternoon though just as I got back home, the fuel pump for the Beige Wonder arrived.

IMG_20210224_160004.thumb.jpg.9770290bfdd87b375ecf96aa4258b043.jpg

Fitting this took me just shy of seven minutes from setting foot out the door to having the engine running.

IMG_20210224_160904.thumb.jpg.2ed8ac5da22350b9ddd4293890304922.jpg

Just thinking about this, I do wonder if the additional check valve in the carb which had caused some head scratching (which was still missing a spring though) was a measure added to deal with leaky valves in the fuel pump.  You used to be able to see bubbling in the filter once the engine had stopped for a few minutes as the fuel slowly drained back to the tank.  That doesn't seem to be happening now.

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  • Zelandeth changed the title to Zel's Motoring Adventures...Jag, Citroens, Mercedes & AC Model 70 - 24/02 - BX Fuel Pump Replaced...
8 minutes ago, Zelandeth said:

The downside of this video source...that the files are both several gigabytes in size...so they're not going to be uploaded anywhere today.  Tomorrow maybe.

you have a Dual Processor workstation, surely you can transcode them into something smaller for easier/quicker uploading? :) (plus pegging all the Cores of high core count computer and watching all the bar graphs rise in the CPU usage monitor never gets old)

 

happy to see TPA out and about, ill never tire of seeing a Model 70 out and about it just makes me grin so much to see one mingling among modern day life :) 

hows the belt running/1K milestone doing? :) 

 

and glad to see the Fuel pump change on the BX (The beige wonder, I like that :) ) was an easy job, but very suspicious it was so easy given its french...

(maybe you want to do some permeative work on those rear spheres so they come off easy before the imbalance of the fuel pump swap going well, welds them to the car LOL)

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2 minutes ago, LightBulbFun said:

you have a Dual Processor workstation, surely you can transcode them into something smaller? :) 

 

happy to see TPA out and about, ill never tire of seeing a Model 70 out and about it just makes me grin so much to see one mingling among modern day life :) 

hows the belt running/1K milestone doing? :) 

 

and glad to see the Fuel pump change on the BX (The beige wonder, I like that :) ) was an easy job, but very suspicious it was so easy given its french...

(maybe you want to do some permeative work on those rear spheres so they come off easy before the imbalance of the fuel pump swap going well, welds them to the car LOL)

That involves me actually having five minutes to sit down at said workstation - plus I realised that I didn't actually have an editing system set up earlier.  To be honest there's no reason not to upload the full quality versions - just means I need to be able to just leave it going for a while - albeit with the connection throttled.  Four days.  In four days I will be rid of this piece of crap router so won't need to do stupid things like that (if you've got any one machine uploading at more than about 5Mb/S it totally kills all internet access for every other device - the traffic management is THAT bad).

 

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12 minutes ago, Zelandeth said:

That involves me actually having five minutes to sit down at said workstation - plus I realised that I didn't actually have an editing system set up earlier.  To be honest there's no reason not to upload the full quality versions - just means I need to be able to just leave it going for a while - albeit with the connection throttled.  Four days.

fair enough :)

although as a side note future reference/tip, I think handbrake is a good tool/application for just feeding video files in and transcoding them out to something else, without having to setup a full editing system

12 minutes ago, Zelandeth said:

Four days.  In four days I will be rid of this piece of crap router so won't need to do stupid things like that (if you've got any one machine uploading at more than about 5Mb/S it totally kills all internet access for every other device - the traffic management is THAT bad).

do you have to return the Router, can you after those 4 days rip the thing out, and do horrible things to it/its main logic board with a screw driver on the end of a long piece of PVC pipe, with the screw driver connected to the output of an MOT? (recorded for our entertainment of course :) )

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Okay, let's have a look at this carb.

Ten minutes and it's off.

IMG_20210225_130959.thumb.jpg.437f5170994bbcfbf54828f669991f83.jpg

The correct home for the mystery ball bearing has been found, there should be one at the end of a spring on the choke mechanism... there's not.

IMG_20210225_131652.thumb.jpg.430713bed31824b18825e82dd3042130.jpg

That has now been reinstated in the correct place.

The accelerator pump was never going to work how it had been assembled.  This was what I found when I removed the cover.

IMG_20210225_131951.thumb.jpg.b4d410315daa005437039e768098abea.jpg

That spring should be pushing the plunger back out...however it's been installed on the wrong side of the diaphragm.  We've all been there at some point!

With it put back in the correct place however it still doesn't work.  There appears to be a hard blockage somewhere between the float bowl and the accelerator pump chamber.  I'll try giving it an overnight soak and long stint in the ultrasonic cleaner...but I have my doubts about being able to get it cleared if it's not shifted so far.  Hmm...

Back together for now so the car at least can be moved while I consider my options.

IMG_20210225_142342.thumb.jpg.2a6597186584d45e66e8b2c6770e46e5.jpg

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