1965 Mk1 Glass Bowl fuel pump

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Buddy Holley
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1965 Mk1 Glass Bowl fuel pump

#1 Post by Buddy Holley » Wed Mar 02, 2022 8:05 am

I have a MK1, a 1965 Triumph 2000 which when I bought it, it came with a aftermarket fuel pump. When its cold the pump seems to work and runs on idle fine so when I take it for a spin the engine stalls after travelling very short runs of 200 or 300 yards, but when its hot it doesn't seem to pump, so when I pump it by hand to prime the carbs again It seems not to pump. now when I back of the nut on the fuel pump nearest to the bulkhead on the side which the fuel flows in it does help. is this the wrong pump? I know it isn't filled up with petrol so could it have been there was not enough petrol in it to fuel it? Is it the cabs themselves? it has been sat around for 7 years, Any ideas?
1965 Triumph 2000 Overdrive
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Re: 1965 Mk1 Glass Bowl fuel pump

#2 Post by johnnydog » Wed Mar 02, 2022 5:09 pm

Are you saying the car has a glass bowl fuel pump, or the metal topped version? Either will work fine (as long as it is the correct one) - the only difference beside their appearance is the position of the feed on the inlet side.
Pumps can look identical but if the operating lever on the engine side is the wrong profile, it won't work correctly if at all. After engine no. MB70000, the profile was more curved.
Screenshot_20220302-164454.png
Sometimes aftermarket locking fuel caps cause problems with vacuum pressure in the tank - I would make sure you have the original twist fit AC cap to be certain that a faulty cap isn't adding to the symptoms (plus they arent as prone to leak with a near full tank as much as locking caps!)
If the car been left with modern 95 unleaded with 5% ethanol content in the tank (as it was then), after 7 years of standing, the fuel is likely to have degraded, and left silt in the bottom of the tank and probably in the fuel bowls, both of which would be likely to cause possible issues you describe.
I would be tempted to drain what fuel is in the tank by undoing the union / pipe for the fuel line from the area above the diff, seeing what comes out, maybe adding a gallon of fresh fuel to help swill it out. I would also blow air through the fuel line - it is metal on the Mk1 and may have internal corrosion. If there is rusty crud coming out of the tank, then you may have to remove it to flush it out properly, or at worse get it sealed or replace it. Ethanol is very corrosion on metal components, and the inside of tanks rust. I would also remove the fuel pump, give it good clean out as they collect silt too (also checking it is the correct profile as above), and operate the priming lever with your thumb covering the inlet side to see if it sucks.
Having done these two, try it with some fresh fuel. If it still stalls, then I can only suggest a carb strip down to clean any possible sediment from the fuel bowls, making sure the float bowl needle values aren't blocked, and are correctly set.
And finally, when you do get it running right, personally, I would use 98 Super Unleaded with 5% ethanol (as opposed to standard unleaded which is 10%), and an additive to reduce the harmful effects of ethanol.
Last edited by johnnydog on Thu Mar 03, 2022 7:09 pm, edited 1 time in total.
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
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Re: 1965 Mk1 Glass Bowl fuel pump

#3 Post by Phil T » Wed Mar 02, 2022 7:15 pm

First things first, with coil disconnected remove the fuel pipe to the carburettors, put into a collection device (jam jar!) and turn the engine over to check the flow. It should be healthy!

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Re: 1965 Mk1 Glass Bowl fuel pump

#4 Post by johnnydog » Wed Mar 02, 2022 11:26 pm

I think this topic is in the wrong section - probably should be moved by Admin to Engine or General Triumph Problems?
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

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Re: 1965 Mk1 Glass Bowl fuel pump

#5 Post by Buddy Holley » Thu Mar 03, 2022 5:53 am

Thanks johnnydog and Phil T for the replies. The fuel pump is a metal topped pump which came with the car when I'd bought it and wouldn't mind an original one if not too pricey, and from some research I understand that there are two different types of armature levers on the engine side of the pump. I'm not sure if its the flatter profile or not, Im 100% sure that the fuel filler cap is an ac delco one, im putting super unleaded in the tank. Thanks fellas there's some great tips for cleaning tank/lines out. Yes, as its sat for 7 years I think it will be and it does smell so I think the inevitable fuel tank, lines, pump and possibly the carbs will definitely need cleaning/blowing through. Also Johnnydog are you referring too look at my chassis no to see if the pump is the flatter or more curved one? Yes it maybe in the wrong section sorry im a newbie, Warm Regards, Matt.
1965 Triumph 2000 Overdrive
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Citroën Zsara

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Re: 1965 Mk1 Glass Bowl fuel pump

#6 Post by Charles H » Thu Mar 03, 2022 8:54 am

johnnydog wrote:
Wed Mar 02, 2022 11:26 pm
I think this topic is in the wrong section - probably should be moved by Admin to Engine or General Triumph Problems?
Moved as requested.
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Re: 1965 Mk1 Glass Bowl fuel pump

#7 Post by johnnydog » Thu Mar 03, 2022 5:17 pm

Hi Matt,
Yes, I probably misled you - it should be engine no. MB70000 where the change took place. However, you need to physically check the engine no. on the block rather than going off the V5, just in case it may not have its original engine fitted!
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

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Re: 1965 Mk1 Glass Bowl fuel pump

#8 Post by johnnydog » Fri Mar 04, 2022 10:06 am

A possible source for spares, especially as it is the same era as yours?
https://www.ebay.co.uk/itm/triumph-2000 ... 635-2958-0
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

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Re: 1965 Mk1 Glass Bowl fuel pump

#9 Post by Buddy Holley » Fri Mar 04, 2022 10:35 am

Seen it johnnydog. ill text them again as i think I messaged before but no reply. well done though, cheers for the prompt
1965 Triumph 2000 Overdrive
Royal Enfield 500 Bullet
Citroën Zsara

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