Lancia Motor Club Forum Banner
28 March, 2024, 12:18:25 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Need to contact the Forum Administrator? e-mail forum.admin@lanciamc.co.uk, for Database Administrator e-mail database.admin@lanciamc.co.uk      -      Copy deadline for Viva Lancia is 12th of each month.      -      For Events e-mail events@lanciamc.co.uk      -      To Join the club go to http://www.lanciamc.co.uk/join.htm
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: 6V fuel pump  (Read 5259 times)
0 Members and 1 Guest are viewing this topic.
brian
Megaposter
*
Posts: 279


« on: 16 June, 2019, 08:45:03 AM »

I am beginning to think that my Aprilia's failure to run for any time at higher revs (see Aprilia tank removal!) is down to the new fuel pump fitted on its engine rebuild.
To test this hypothesis (at least the 3rd so far) I have searched online and there are posts from USA about fitting 12V pumps on 6V cars and its working perfectly. This would save me buying a different pump as I have a few Flavia ones lying about. If it does work, all well and good and if not I need a Hypothesis 4.
I cannot see a way of increasing the flow on the Airfix E8011 that was fitted.
Has anybody any ideas on this before I do the deed?
Logged

Brian Hands


1922 Hands Tourer
1934 Augusta standard saloon
1938 Aprilia S1 saloon
1953 Aurelia B10
1965 Flavia Sport
Mikenoangelo
Megaposter
*
Posts: 459


« Reply #1 on: 16 June, 2019, 10:08:18 AM »

Have you tried it since sorting out the fuel supply pipe? An air leak between tank and pump seems a likely cause.
Mike
Logged
simonandjuliet
Permanent resident
**
Posts: 2538



« Reply #2 on: 16 June, 2019, 10:35:05 AM »

Have you thought about running without an electric pump - the mechanical pumps are v good and I recently had some new ones made that are now available at a reasonable price ( in France). Just make sûre the gaskets are not too thick and the rod not worn. Others have fitted 2 cv pumps but you need to change the pipes if it’s not an original set up
Logged

AmilcarCGS, ApriliaCabrio,S2Aprilia,Ardea c'cino,S4 Ardea, Appia c'cino, Appia f'cino,B20 s4,4 R4 Sinpar, R4 Rodeo, 65 Moke, 2xR60 Tractor, 2xToselli 78, Moto Guzzi Ercole, Disco 3, Mini ALL4 JCW, Moto Guzzi Cardellino, Fulvia GT, RE Himalayan, Ypsilon
brian
Megaposter
*
Posts: 279


« Reply #3 on: 16 June, 2019, 11:05:47 AM »

I did have a small leak at the flexible hose near back of car but problem persisted after sorting.
The car had an electric pump when I got it and so I assumed it was a reasonable thing to do and the old one worked well until the engine rebuild when for reasons I did not know it needed replacing. On the car at ther moment is an Airfix E8011 said to deliver at 5-8PSI.
Logged

Brian Hands


1922 Hands Tourer
1934 Augusta standard saloon
1938 Aprilia S1 saloon
1953 Aurelia B10
1965 Flavia Sport
JohnMillham
Permanent resident
**
Posts: 1045



« Reply #4 on: 16 June, 2019, 06:12:10 PM »

On the car at the moment is an Airfix E8011 said to deliver at 5-8PSI. That sounds like too much pressure. 2 or 3 p.s.i. is usually plenty. I use a pressure reducing valve on my Lambda, which seems to work OK.
Logged
Raahauge
Senior Member
*****
Posts: 127


« Reply #5 on: 16 June, 2019, 08:35:11 PM »

Have you tried disconnecting the feed to the carb and pumping the petrol into a (measured) container?
Logged
brian
Megaposter
*
Posts: 279


« Reply #6 on: 17 June, 2019, 07:47:16 AM »

Please excuse my ignorance but:
1. How does a higher pressure than that needed cause a drop in available fuel at the carburreter?
2. What would I be looking for if I disconnect the outlet and measure the volume? I did this and "lots" came out - a little fountain not a dribble.
Brian
Logged

Brian Hands


1922 Hands Tourer
1934 Augusta standard saloon
1938 Aprilia S1 saloon
1953 Aurelia B10
1965 Flavia Sport
GG
Megaposter
*
Posts: 552



WWW
« Reply #7 on: 17 June, 2019, 09:00:02 AM »

Have you tried putting a pressure gauge on the fuel line and seeing what is actually delivered? Not too sure about Aprilias, but on Aurelias, we found the pressure varied immensely by the rod and the gasket thickness (as noted above, thank you!). Just the gasket thickness itself, was enough. And the elec pump on the Aurelia ran through the mech'l pump - so more pressure didn't really matter at all (actually, would hurt the mech'l pump with too much on the diaphragm).
Logged

B20 s.2, Appia C10, Flavia 2000
DavidLaver
Permanent resident
**
Posts: 4365



« Reply #8 on: 17 June, 2019, 04:11:51 PM »

Not sure its the answer here (pretty sure its not the answer here...) but an idea:

https://www.ebay.co.uk/itm/Sealey-1-Litre-Portable-Fuel-Tank-Ideal-For-Test-Beds-Or-Temporary-Start-Up/141957834894?epid=1005385530&hash=item210d58a88e:g:V94AAOSwBc5cwF9M&frcectupt=true

The assistant sits in the passenger seat holding it at different heights to vary delivery head?!!!?Huh?

Hang it off the rear view mirror???!!!!!!???!!!

Is there a rolling road locally to run tests in "laboratory conditions"?
Logged

David Laver, Lewisham.
davidwheeler
Permanent resident
**
Posts: 1469



« Reply #9 on: 18 June, 2019, 09:33:25 AM »

I have fitted a Flexolite 6v pump and a Filter King filter/pressure valve from here https://www.flexolite.co.uk/cat.asp which works perfectly and seems to be the correct pressure.  It is in the boot close to the tank thus obviating any trouble with vacuum leaks.
Logged

David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
brian
Megaposter
*
Posts: 279


« Reply #10 on: 18 June, 2019, 03:00:18 PM »

It is beginning to look like an issue in the Zenith 36V12 carb as if I run at moderate revs it empties the float chamber. Pump generates a flow of about 1L/min when no carb attached to line. If bowl off I can get a fountain of fuel over the right side of the engine bay and stop it by pressing the cut-off in the carb top.
Brian
Logged

Brian Hands


1922 Hands Tourer
1934 Augusta standard saloon
1938 Aprilia S1 saloon
1953 Aurelia B10
1965 Flavia Sport
brian
Megaposter
*
Posts: 279


« Reply #11 on: 19 June, 2019, 11:38:57 AM »

Hallelujah!!
Finally sorted and as suspected was something trivial. After the last check I was putting the float chamber back and was struggling to keep the gasket in place and I just wondered if this was the problem and so put a couple of dabs of blue Hylomar to keep it in place whilst I slid the chamber back. I then started up and ran for 10 mins at half throttle with no hint of misfire. Just driven 25miles on A38 at 45-50MPH with not a single misfire.
Answer therefore was that the carburreter rebuild was fine except for the gasket was crumpled over a jet or cut off valve and if driven below 40MPH enough petrol got through but faster the flow into the chamber was reduced and spluttering etc.
I was discussing with my friend who has a Stag and he eventually found a similar symptom was due to a hair ball in the fuel line in a wide rubber bit between the copper pipes and at low speed enough fuel got through but at higher flow the hair compressed and reduced the flow.
Thanks for all the advice which did help to rule things out.
Brian
Logged

Brian Hands


1922 Hands Tourer
1934 Augusta standard saloon
1938 Aprilia S1 saloon
1953 Aurelia B10
1965 Flavia Sport
DavidLaver
Permanent resident
**
Posts: 4365



« Reply #12 on: 20 June, 2019, 09:38:18 AM »


Great news... 
Logged

David Laver, Lewisham.
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2021 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines
Page created in 0.057 seconds with 20 queries.