Sudden complete loss of fuel delivery

Talk about the E-Type Series 1

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Vonkie
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South Africa

#21 What is this gunk in petrol tank??

Post by Vonkie » Fri May 11, 2018 5:04 pm

Well. The following interesting picture presented itself on clearing out the fuel tank.

The stuff looks like mud. Apparently it is not magnetic (but surely rust can lose its magneticism?) I have not seen it myself. This picture was taken 2 days ago, and in the meantime the stuff has dried and I am told looks like sand. My guy is stumped, as he says the fuel tank was flushed out in November when the silicone was found in the banjo bolt to the fuel pump.

He says the glass bowl filter is clean (i.e. the fuel line filter where I found the little bits of what looked like silicone), fuel system has been flushed, and the car runs well on testing. Tiny hesitations still felt, but theory is electrical rather than fuel starvation. New champion plugs fitted too.

Anyway. I would love some clever theories on what this gunk is. And how it could have got there. I was thinking the new epoxy paint that I was told was applied to coat the tank on the last clean-up could have become this gunk. Ideas on next steps here would also be welcome. I have been swallowed by urgent work crises and unable to attend to my car, but am fetching her tomorrow.

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Frank
1963 3.8 FHC

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Geoff Green
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#22 Re: Sudden complete loss of fuel delivery

Post by Geoff Green » Fri May 11, 2018 5:16 pm

Fuel sitting for a long time will turn into a carbon like substance.

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mgcjag
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#23 Re: Sudden complete loss of fuel delivery

Post by mgcjag » Fri May 11, 2018 5:30 pm

Hi Frank....the tank may have been flushed out but a thourough clean out and inspection should be made...if the inside has rusted it will continue to flake of......either sealing the tank inside or a new tank should be thought about....Steve
Steve
1969 S2 2+2 & Building a C type replica

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Vonkie
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#24 Is that rust?

Post by Vonkie » Fri May 11, 2018 9:16 pm

Thanks Steve

That seem like rust to you? Helluva lot, whatever it is!
Frank
1963 3.8 FHC

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jagwit
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#25 Re: What is this gunk in petrol tank??

Post by jagwit » Sat May 12, 2018 5:47 am

Vonkie wrote:
Fri May 11, 2018 5:04 pm
to attend to my car, but am fetching her tomorrow.
Myself and two other E-types are having breakfast at Vovo Telo this morning at 9:30 am....
Best Regards
Philip
71 E-type V12 Coupe,
80 XJS (EFI by Megasquirt & EDIS-6 + 5sp manual overdrive)
73 Jensen Interceptor
74 Interceptor (EFI by Megasquirt + overdrive 4sp auto)

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Vonkie
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#26 Re: Sudden complete loss of fuel delivery

Post by Vonkie » Sat May 12, 2018 7:11 am

Will have to give it a skip - only going to pick her up now and must fetch kids later.
Frank
1963 3.8 FHC

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Vonkie
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#27 It seems it's sand! But whence??

Post by Vonkie » Sat May 12, 2018 7:13 pm

The dried up gunk is so fine (not flakes at all), and completely unmagnetic. It certainly does not look like rust. I now have it in my custody, and want to get it analysed.

If it is sand/dirt, then there is a (small and weird) possibility that it got dumped there by a fuelstation which had sand in its underground tank, but this is very unlikely.

Do people agree that the dried stuff in these photos does not look like rust, or paint, but like sand?? And how on earth could that get into the tank? The total quantity is about 3 tablespoons.

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1963 3.8 FHC

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Geoff Green
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#28 Re: Sudden complete loss of fuel delivery

Post by Geoff Green » Sat May 12, 2018 7:54 pm

Frank,

It will be interesting to find out what this is. I have cut a couple of fuel tanks in half to be able to recycle the steel. Non explosive when in two pieces they say.

One had been sitting for 15 years at least with some fuel (tank still in the car) and when cut in half I found the same stuff you did. I am guessing the fuel returned to it's base form carbon.

Simon might explain how. :scratchheadyellow:

Geoff

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Vonkie
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#29 Fuel tank lined

Post by Vonkie » Sun Jul 01, 2018 3:38 pm

The "sand" came back again and the fuel delivery problems persisted.

The fuel tank was then drained, acid bathed and epoxy lined.

Yesterday I did 60 miles. Today I did 173 miles. She drives beautifully and there is no trace of hesitation in delivery, whether accelerating or coasting. A large part of the drive today was between 85 and 90 mph. Short bursts between 90 and 100 mph. I probably won't attest to that if formally interrogated.

Seems the stuff was rust. Not been analysed yet (yes, a tad frustrating), but the fact that it came back meant it was indeed internal to the tank. Let's hope the lining lasts well.

The Lucas starter is holding up well. Hot starts and cold starts. Maybe I can start looking at those long trips for overnight stays now. I am planning a little adventure one holiday soonish - My house North of Johannesburg to Cape Point (1500km shortest route; realistic route just over 1000 miles). Probably a two stop race. Flatbed on standby.

Meanwhile, I am just loving her. Frustrations and foibles and all - the graph tends towards gradual elimination of issues with much usage. Over 3500 miles since October. At times, a bit of a timeshare exercise with my chappie. But we have a decent thing going. His shop is 20 miles away, so at least fetching her always entails a proper test run! So far, been lucky - no dings, no blow-outs, no idiots smashing into her, no hijacking, no theft. Of course, some days hanging around highways in the middle of nowhere or waving traffic past and feeling a bit spare, on days when I don't really have the time. Getting drunk execs outside a spiffy club to push start her on condition they "can put in an offer". And such stuff. Tiny little nicks from lots of long drives, but nothing more than what is to be expected. Long may that continue.
Frank
1963 3.8 FHC

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