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fuel pump

Posted: Wed Dec 26, 2012 5:26 pm
by danny1
it seems like my imps fuel pump has given up

anyone know one that will fit?

Re: fuel pump

Posted: Wed Dec 26, 2012 5:49 pm
by kilty
:) Another Imp one?
They are plentiful. :wink:

Drew

Re: fuel pump

Posted: Wed Dec 26, 2012 6:05 pm
by danny1
ive checked ebay and cant find one

were sells them lol

Re: fuel pump

Posted: Thu Dec 27, 2012 12:09 pm
by 617sqn
Perhaps the title of this area is a give-away there, mate.

Merry Christmas !

Andy G. Image

Re: fuel pump

Posted: Thu Dec 27, 2012 12:26 pm
by Dom
I'm sure some one out there has more than enough spares, but I made a thred asking if any one had two for sale over a week ago and no one replied ?

Imp029

Re: fuel pump

Posted: Thu Dec 27, 2012 12:39 pm
by 617sqn
7100090/1101 fuel pump new 1 30.00
This is from the IMP CLUB SPARES list on pdf file.

Come on lads, it ain't rocket science :D . And there is always the usual sources such as Speedyspares and Malcolm Anderson.

Andy G. Image

Re: fuel pump

Posted: Thu Dec 27, 2012 12:42 pm
by danny1
alright sorry.

this isnt the easiest forum to use!

and both those companys dont do fuel pumps i checked!

Re: fuel pump

Posted: Thu Dec 27, 2012 12:52 pm
by SimonBenoy
Danny

I'm sure that Malcolm Anderson does Imp fuel pumps. He does all Imp parts.

Cheers

Re: fuel pump

Posted: Thu Dec 27, 2012 1:09 pm
by danny1
im ok now i managed go get it workign again but ill keep it in mind for the future thanks for the help :)

Re: fuel pump

Posted: Thu Dec 27, 2012 2:28 pm
by 617sqn
this isnt the easiest forum to use!
Oh, I apologise Danny. It's always a good idea to use the search facility as well as looking at the options available at the head of any particular area. The fact that this was noted as Imp Club spares should have given you a bit of a clue, but I can appreciate that not everyone is used to how these things work. And it may be that non-members can't get access to it, so I'm sorry about that if you can't. Speedyspares is based in Portslade near Brighton and they do mail order so you wouldn't have to go there. Their web site is simple and effective, although not everything they sell is listed. Sometimes best if you can find the part number first and then google it.

Andy G. Image

From Speedies site : http://www.speedyspares.co.uk/ROOTES/IM ... Page2.html

malcomanderson.co.uk : Petrol Pump, newly remade, not AC type £32

Re: fuel pump

Posted: Thu Dec 27, 2012 3:03 pm
by danny1
cheers
sorry wasnt having ago

i do plan on joining as im going to be looking for spares for my imp soon

Re: fuel pump

Posted: Thu Dec 27, 2012 10:49 pm
by Dom
I asked on the forum because i don't have allot of money atm with no job, i was hoping to pick up a 2nd hand one for a few quid or a drink at the next national or something like that, i assumed that some one in the imp club would have a spare fule pump to sell me.

Re: fuel pump

Posted: Fri Dec 28, 2012 11:28 am
by 617sqn
No harm in asking Dom. Perhaps all those with a spare fuel pump wanted to hang onto it for their own use "just in case".

I don't have one anymore, having 1) given it to a young member a few years back and 2) I'm all electric :lol:

The Imp Club spares do a rebuild kit for about a tenner.

Andy G. Image

Re: fuel pump

Posted: Fri Dec 28, 2012 10:04 pm
by imporium
Dom wrote:I asked on the forum because i don't have allot of money atm with no job, i was hoping to pick up a 2nd hand one for a few quid or a drink at the next national or something like that, i assumed that some one in the imp club would have a spare fule pump to sell me.
Maybe Farter Christmas will send you a good used one on Monday.... :roll:... :wink: & sort it out later ok......Malcolm... Imp009 Van001 Husky003

Re: fuel pump

Posted: Fri Dec 28, 2012 11:49 pm
by briang
[b]Maybe Farter Christmas will send you a good used one on Monday.... :roll:... :wink: & sort it out later ok......Malcolm... Imp009 Van001 Husky003 [/b][/quote]


Has Santa been on the sprouts ? :)

Re: fuel pump

Posted: Sat Dec 29, 2012 11:43 am
by danny1
santa gave me socks like he has for the past 4 years,

im gonna be naughty as i dont want socks anymore

Re: fuel pump

Posted: Mon Aug 12, 2013 7:45 am
by bouncybili
If you're still looking I've got loads of old ones.

Re: fuel pump

Posted: Mon Aug 12, 2013 9:40 am
by The Nun
danny1 wrote:santa gave me socks like he has for the past 4 years,

im gonna be naughty as i dont want socks anymore
Maybe he will drop you off some hankies then instead. :wink:

Re: fuel pump

Posted: Mon Aug 12, 2013 11:30 am
by 617sqn
If you're still looking I've got loads of old ones.
Who on earth would want old socks ? :o :o

:D

Andy G. Image

Re: fuel pump

Posted: Thu Jul 20, 2017 2:36 am
by GaryH
Hi
I'm using a pump of later external appearance to the original AC Type YD. Newly remanufactured a couple of years ago, as I understand the situation.
Other than lacking the old hand-priming lever (useful after car not used for a couple of weeks - rare in my case but we didn't take it on holiday to Canada! :-) , I've found that its delivery-pressure is too high. "Adding gaskets" is no help - it's presently packed-out by almost 5 mm which is proving n-e-a-r-l-y enough. Delivery pressure is still only just under 2.5 psi; spec range is 1-1/4 to 2 psi. The resulting problems were always subtle and transient; as now packed-out they've become infrequent but this is annoying, especially when I remember that the annoyance is accompanied by shoveling excess fuel into the carb. BTW Pressures exceeding 3.5 psi will blow fuel through the needle-valve regardless! With the present running-pressure of 2.5 psi, engine occasionally hiccups on over-run when hot; spits a little fuel out the manifold-drain sometimes , coinciding with slightly reluctant hot starting.. I'm sure (from an extended chain of observations) that this is caused by cold fuel expanding in the pump; if engine is stopped coming up to #1 firing, the pump-diaphragm will already be at max against the spring so expansion will take the pressure higher than the set value.
My suspicion is that at remanufacture, the old diaphragm-spring made of Imperial-dimension wire was rounded-up to the nearest heavier metric size?
Has anybody else been digging into/wrestling with this?
Does anybody know the manufacturer of that later-style pump?

Re: fuel pump

Posted: Thu Jul 20, 2017 6:44 am
by 617sqn
Why not fit a pressure regulator and be done with it ?

Andy G

Re: fuel pump

Posted: Thu Jul 20, 2017 7:22 am
by GaryH
Hi Andy
Because
a) these pumps are inherently pressure-regulated, and
b) adding junk between the non-return valves of the pump and the needle-valve will subject more petrol to thermal expansion, with the same possibilty of forcing past the extra needle-valve and then the one in the carb, (rembember that liquids are barely compressible at all) and
c) It really shouldn't need it! :-)
As presently packed-out, it regulates solidly at a whisker under 2.5 psi regardless of revs. but there are nuisance-factors creeping in, such as having to take the carb off to remove/refit pump...
-
If I end up adding anything, it would be to follow the Japs and add a fuel-return pipe forward to the tank.

Re: fuel pump

Posted: Thu Jul 20, 2017 10:12 am
by AnonymousUser
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Re: fuel pump

Posted: Thu Jul 20, 2017 11:37 am
by GaryH
HI John
Thanks for your thoughts; I'll certainly store then in the 'arsenal' that seems needed to properly resolve this.
The pressure is defined by the combination of stroke, effective diaphragm area and spring-compression, whereas the maximum throughput (e.g to refill a dry float-bowl) is area x stroke, regardless of the spring. by limiting the pressure by packing (or hacking the lever :-) ) we can bring down the pressure but eventualy a point may be reached where available displacement becomes insufficient. So to make a large correction in pressure the spring should be the primary target. I'd love to know the wire-gauge and free-length of the spring from an original one of this later-pattern pump. (not YD; it has stouter castings and the top-cap is held down by a hex-head bolt, recessed into top-cover.) I still suspect that either the spring has been wound incorrectly, or the wire-gauge 'rounded-up' to a Metric size...
-
Along the way I found that making a "packing" out of 1.6 mm aluminium decreased the heat-soak to the pump when engine stopped by over 8 degC....
cheers
GaryH

Re: fuel pump

Posted: Thu Jul 20, 2017 11:56 am
by AnonymousUser
...

Re: fuel pump

Posted: Thu Jul 20, 2017 11:49 pm
by GaryH
HI John
Yep, "odd coughs and splutters" sounds familiar.... LL has long been regarded as a good runner; sundry effects put down to "Solex", less-than-smooth take-up when throttle re-applied to "cable throttle" etc. But the more I dig into fuel-pressure-related issues, the more these effects go away. So I want to get to the specified pressure range using the equipment that 'should" achieve it. :-)
Meantime, the car is overall a nice drive anyway. :-) :-)

Re: fuel pump

Posted: Fri Jul 21, 2017 9:46 am
by AnonymousUser
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Re: fuel pump

Posted: Sat Sep 08, 2018 5:04 pm
by spares
Your problem is ethanol! Nice to drink, but not for your Imp.

It is causing failures in rubber components. I have some alternative materials that are "ethanol proof"

I also have Imp fuel - pumps orginal AC type in stock.

Re: fuel pump

Posted: Sat Sep 08, 2018 9:54 pm
by GaryH
Hi Bob
Thanks for info, but the issues I described are not due to ethanol. The brief flirtation with ethanol here was trying 98-octane fuel which was "up to E10", but its availability came and went so I reverted to 95 well over a year ago. What it DID do was dissolve 50 years of some deposits which must have been residues that were insoluble in hydrocarbons; this caused a brief round of fine crud but then cleared. At present I have a newer AC type YD top-casting fitted onto the original pump bottom-end; pressure just under 1.5 psi and all happy. But I still have the near-new later type pump (which I forget whether it came from Spares or from Malcolm?) which as mentioned previously required unreasonable amount of packing-out to get it down to anywhere near 2 psi. I'm trying to think of ways to tweak its spring without having to do too many rounds of "cut & try" on the car. It still owes me about $35!
cheers
GaryH

Re: fuel pump

Posted: Sun Sep 09, 2018 8:42 am
by spares
Thanks Gary, that's interesting.
I have come across thick spacers in the past, never thought they were any use on Imps as I never saw any fitted.
I have a load of NOS pump parts here ready for assembling and have just bought a load of new springs but if anything they are slightly stronger than the original (not much). Let me know if you need any bits though as I may be able to help...

Re: fuel pump

Posted: Sun Sep 09, 2018 2:53 pm
by The Nun
A thick spacer 1/4" or so was used and factory fitted on my 75 Sport when new.

Re: fuel pump

Posted: Sun Sep 09, 2018 10:22 pm
by GaryH
Thanks Bob and Peter for info.
That's very interesting, because I ended up at nearly 1/4" and still with pressure over 2 psi. BTW part of my spacer-stack was a larger 1.6 mm aluminium 'fin" which I found dropped the temperature at pump just after stopping a hot engine by more than 8 degC.
With the later pump, the original studs are not really long enough already (base thicker by 1/16"); inlet-manifold studs are 1/8" longer which helps but with the total 5.6 mm I had before reverting to an original pump, only two studs ex a transaxle front-cover were long enough. These make removal & refit of pump without removing (autochoke) carb a bit difficult, but still doable.
I have a spare complete head & cambox; will try to establish where in range of the spring that it's actually working and attempt (with long-forgotten maths...) to convert diaphragm force into pressure.
The reward for what was a LOT of p*ssing around has been more-refined driving :-)
cheers
GaryH

Re: fuel pump

Posted: Mon Sep 10, 2018 7:10 am
by 617sqn
Would it not have been instantly beneficial to have fitted a pressure regulator ? Just saying.......

Andy G

Re: fuel pump

Posted: Mon Sep 10, 2018 7:48 am
by The Nun
617sqn wrote:Would it not have been instantly beneficial to have fitted a pressure regulator ? Just saying.......

Andy G
I guess a piece of 1/4" plastic as a shim is a cheap way of trying to do the job? Think of all the pence it saves. :wink:

Re: fuel pump

Posted: Mon Sep 10, 2018 9:27 am
by GaryH
The pump is of itself an excellent pressure-regulator. Just not with an adjustment-screw...
Some of the ill-effects of engine-bay residual heat are due to the volume of fuel trapped between pump & carb, so best to minimise this.
While this all seems to spectators to be unnecessary faffing around, the end result is already a nicer car to drive overall. The last challenge is to re-calibrate that pesky new pump...
BTW most new purchases to "try something" attract a very large postage or shipping overhead.
cheers
GaryH