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1974 MGB GT - The Mustard (Mit) Mobility Scooter

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Got the car back today with a new Hardi pump on. Didn't manage to speak to the guy that did it, so not sure exactly what was done. Hopefully it was properly diagnosed. If not, it'll be going back for them to sort again...

I pulled the pump apart. Couldn't see anything obviously wrong with it. The electronic driving circuit is pretty symbol. Looks to be a Darlington pair driver connected to a 4000 series IC - probably a Schmitt trigger set up as a debouncer. The solenoid position is done by a switch, which is a bit of a disappointment. I was expecting optical or magnetic to make it fully solid state. Contacts are ok but they do wear and get dirty.

Basically these pumps are essentially SU pumps with driver electronics on the end. The driver electronics is like a mini version of a ignition points assistor.

Here are some pics from pulling apart.

You can see the points here

Diaphragm like an SU

Bottom is a cavity with two small plastic discs on the input and output that acts as valves

Close up while actuating it

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Wow, the microswitches in the Hardi are a bit of surprise.

AFAIK, the solid state SUs use a hall effect sensor. I don't know that 100% for sure-I'm not inclined to pull mine off now and look, and the person I can think of who would know passed away last year. Still, though, it's been tossed around enough that I'm PRETTY sure it's the case.

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1 hour ago, The Mighty Quinn said:

That pump looks like 50p's worth of Chinese crap.  Can you not buy new SU pumps now? Burlen Services took over the SU name iirc and make new SU carbs.

SU/Burlen makes new production pumps of both the points type and the electronic type.

I have the latter in my MG, and it has worked perfectly for quite a few miles and about 4 years now with it pleasantly ticking away. As I said, I understand it to use a hall effect sensor rather than a microswitch as shown on the Hardi above.

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12 minutes ago, The Mighty Quinn said:

Is it not possible to fit a mechanical pump?


That Hardi thing looks appalling, badly finished monkey metal shite.

18V blocks have a convenient mounting point for a mechanical pump. A Marina mechanical pump will fit and work fine.

With that said, I personally have an aversion to them, and will choose an electric by the tank if at all possible. My Marina has a Facet brand(noisy cube) pump as installed by a previous owner, and even though I have a mechanical pump in the car just in case(and I know it works) I wouldn't use it unless I was stranded and didn't have any other choice.

New production electric SUs are well made and of a proven design. The points type can have issues in an infrequently driven car(the points can oxidize and cause the pump to not work, a condition often cured by whacking the pump with whatever blunt object is handy), but especially with a TVS across the points can last forever provided that you let the pump click over every few weeks. The electronically switched SUs tend to give years of trouble free service.

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  • 4 months later...

With so much BL and BMC chod going on here at the moment, I thought it would be rude to not pay the old gal a visit.

Did a quick check over. Only thing of much note is that it looks like we've got a bit of seepage going on here.

Took a bit to get going. But once she's firing, she's very happily running.

6 minute drive later and she's back. Very handy now living around the corner from storage.
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Went for a little jaunt this evening. Remembered why I bought this car and why we moved. Unlike Bristol City, I can buzz around back roads around here at my owns speed. If I did happen to break down, I can simply pull over and wave to the occasional motorist passing.

Anyway here are some scenic pictures out and about.






As I'm sat here writing this, I can smell something.


Poo. At least petrol is cheap at the moment. Hopefully just needs nipping up.

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1 hour ago, LightBulbFun said:

ahh so Majestic what a lovely view!

just like a 1980s CGA program!

Ha yes I don't know how Tapatalk managed to corrupt it. Fixed. 

25 minutes ago, purplebargeken said:

The Ind Estate sign needs photoshopping out and the photo redoing in B&W. It would look ace then. 


What about some olde generic filter thing on my phone? ?


To be fair, the sign could be valid in the late 70s! It's the security camera that ages it. ?

23 minutes ago, 1970mgb said:

I'm often amazed at just how tight those banjo bolts need to be in order to be truly leak free...

Yeah I had to gorilla tighten them on the old pump. This was the replacement pump put on by the local classic friendly garage. To be fair it did it when pulling it out of storage last year, and I'd personally put the last pump on. I suspect because of those fibre washers, they need re-tightening after settling a bit. Just hoping they didn't reuse the fibre washers. 

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  • 2 weeks later...

Spent a good amount of time last night cleaning this and giving it a good polish - including the glass! Just as I finished, a pair of swallows flew over and shat on it. Argh.

Anyway it's supposed to rain tomorrow and I didn't get it to storage in time before it closed. So I thought I'd might as well take it for a blast and make use of it being shiny.

Went a bit further today and had a little run up and down Cheddar Gorge. Unfortunately it's turned into a bit of a boyracer rat run, so there is a 30mph limit on most of it. You now need to be a bit careful of both police cameras and idiots over cooking it and going onto your side of the road.

However in the MGB, you can keep to that speed limit while having fun. I did try filming the route down but the phone mount fell off. I turned around and went back up filming again. The second time had large parts ending up as jelly-vision.

I wasn't going to bother uploading it, but as it's not all bad, I decided to. Also got stuck behind an Audi A1 at the top who was completely unable to deal with corners.

I'll have to figure out a better mount or something and do it again. Maybe wedge the phone in the passenger headrest or something.

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  • 3 weeks later...
1 hour ago, Tomtom said:

Any recent FTP or other excitement, SiC?

Thankfully not at the moment! Its been out for local blasts over the last couple of months. Currently temporarily back in storage as I've filled up at home with a broken 1100 in the garage and the Dolomite Sprint waiting outside to go in for further welding + mechanicals. Also the weather has turned crap recently with heavy rain and thunderstorms, so it probably appreciates being undercover in the dry. 


Engine is still tappy and that annoys the hell out of me. Something I want to sort as it detracts from driving it a fair bit. Also oil is still disappearing somewhere and I suspect out the back of the rear main seal. So once the 1100 is sorted and Dolomite back on the road, the MGB will be next in line for a bit of attention.

I'm thinking that maybe pull the engine and have a light rebuild. Bottom end bearing inspection/replacement and oil pump, then head ported. Rear end is getting pretty saggy too, so the rear springs are going to need replacing. Would like to get some cellulose paint matched up closer so I can deal with the rust blebs that are just starting to come up. 

All of which probably won't happen until next year realistically. In the meantime I'll just be buzzing around in it during times of nice weather. 

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