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Old 23rd February 2015, 18:40   #136
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Default Re: My very own Premier Padmini - Restoration in progress

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Originally Posted by bikertillidie View Post
I am not sure whether the pump can be fed through gravity as the fuel tank outlet is at the top.
========
But thanks a lot for your suggestion anyway!
Well i was not sure, in jeep i had put it under the tank and the outlet was from bottom and it is working well even now.

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Originally Posted by DHABHAR.BEHRAM View Post
Dear Jaggu - hello after a long time.
============
Best regards,

Behram Dhabhar
Hello sir ji, yes been a while. Hope you are doing good.

And here you go, the guruji himself has spoken and that should suffice for now
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Old 23rd February 2015, 18:52   #137
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Default Re: My very own Premier Padmini - Restoration in progress

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Well i was not sure, in jeep i had put it under the tank and the outlet was from bottom and it is working well even now.
Yes Jaggu, in my CJ3B too, the fuel tank outlet runs off the bottom of the tank. Hence, I could explore options for mounting an e-pump below the floor, in case it's needed.
The mechanical pump fitted to the jeep hasn't caused me any grief till date, hence, it remains undisturbed.

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And here you go, the guruji himself has spoken and that should suffice for now

Well, this is one of those perplexing situations which will require further experimentation.
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Old 24th February 2015, 19:20   #138
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Default Re: My very own Premier Padmini - Restoration in progress

Came across a link on e-pump installation.

http://www.how-to-build-hotrods.com/...fuel-pump.html
  • It mentions about providing sufficient amperage to drive the fuel pump via a relay which seems correct.
  • Providing the least resistive path by means of proper grounding also seems sensible.
But some portions just do not make sense.

Why would low amperage cause the pump to generate more heat & fail?

From what I can recall from my school days, the heat generated should equal

(I * I) * R * T i.e. proportional to current squared.

The remaining two parameters would remain constant for the pump.
  • R - Ohmic resistance
  • T - Time
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Old 2nd March 2015, 17:40   #139
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Default Re: My very own Premier Padmini - Restoration in progress

Updates as of 01-Mar -

Owing to incessant rains over the weekend here in Pune, I was confined indoors.

Hence, decided to utilize my spare time to investigate the cause of the fuel pump failure.

The construction of the pump is relatively simple.

It comprises a ferro magnetic piston encased within a brass tube, with one end acting as the inlet & the other acting as the outlet for fuel.

My very own Premier Padmini - Restoration in progress-dsc_0225.jpg
My very own Premier Padmini - Restoration in progress-dsc_0226.jpg
My very own Premier Padmini - Restoration in progress-dsc_0228.jpg
My very own Premier Padmini - Restoration in progress-dsc_0230.jpg

There are check valves located at both ends of the tube to prevent seepage of fuel back into the tank.

The movement of the piston is controlled by a solenoid which is driven by PNP transistors operated as a Darlington pair (packaged within TIP 147 - manufactured by ST Microelectronics), and a spring to bring it back to normal position when the solenoid is powered off.

My very own Premier Padmini - Restoration in progress-dsc_0227.jpg
My very own Premier Padmini - Restoration in progress-dsc_0232.jpg
My very own Premier Padmini - Restoration in progress-dsc_0231.jpg

The body of the pump is meant to act as a heat sink.

As evident from the attached pictures, the PCB along with cables connecting the solenoid are completely fried

Unless better means of cooling the pump were employed, and rugged components capable of withstanding the heat generated during operation used, the pump does not seem capable of sustained operation.
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Old 2nd March 2015, 17:49   #140
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Default Re: My very own Premier Padmini - Restoration in progress

Cam an additional heat sink be added?? or this time try fitting it under the body (a slightly longer pipe should help?) where it gets decent air flow and is away from the exhaust.
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Old 2nd March 2015, 18:29   #141
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Default Re: My very own Premier Padmini - Restoration in progress

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Cam an additional heat sink be added?? or this time try fitting it under the body (a slightly longer pipe should help?) where it gets decent air flow and is away from the exhaust.
I should have rephrased my earlier post a bit differently.

The body of the pump acts as a heat sink for the chip (TIP 147) powering the solenoid. And this chip appears undamaged.

Apologies for the confusion.
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Old 31st May 2015, 00:46   #142
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Fed up with the poor quality of electric fuel pumps available locally, reached out to one of my friends for help..

Here's the end result.... a set of 3 Facet fuel pumps shipped from the US of A.

Planning to install one on Sunday.
Attached Thumbnails
My very own Premier Padmini - Restoration in progress-1433013295615.jpg  

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Old 10th December 2016, 09:46   #143
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Default Re: My very own Premier Padmini - Restoration in progress

Brilliantly detailed thread. This would help me a lot during restoring my Delight.

Its been a year and a half without updates, request you to update the thread.

Cheers
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Old 19th December 2016, 15:48   #144
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It's been nice bumping into you Amit. Hope to see your ride soon
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Old 13th April 2017, 17:50   #145
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Default Re: My very own Premier Padmini - Restoration in progress

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Originally Posted by bikertillidie View Post
Following Mr. Dhabhar's advice, today I checked the distributor & the float level of the carburetor.

The centrifugal advance mechanism was choked with grease (probably caused by the same idiot who last overhauled it). It was cleaned thoroughly of all grease/gunk using some petrol and an old tooth brush.

Finally, a few drops of engine oil was applied on the centrifugal advance mechanism in order to keep it lubricated.

The cam operating the C/B points was also given a light smearing of engine oil.

While setting the timing, had accidentally set it way in advance. The consequent misfiring which ensued has opened up a gaping hole in the exhaust. Will need to be patched

On a positive note, the car now runs like a locomotive with a free flow exhaust (the roar is enough to wake up the dead). Acceleration is simply awesome

The spark plugs would be closely monitored for soot formation for a few more days.

Will downgrade to a 97 size jet if all else fails.

Float level in the carb seems OK (checked by blowing into the fuel inlet).

Attached are a few pictures taken today.

Does anyone know what is the opening below the inlet manifold meant for?
Hello, I know what the object is that is blocked in the INLET MANIFOLD.

It is called an IDLING STABILISER and should be fitted with a small piece of pipe that has a 1mm orifice, the idea is for the engine at idling to suck a little more direct air to balance engine tuning, theoretically, if you block this section, you will find that the engine does not idle smoothly. Most of the older FIAT models were fitted with this idling stabiliser including FIAT 124, 1500, 1800, 2300, 600, 850, etc.

Thank you
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