Alternator issues

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937carrera
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Re: Alternator issues

Post by 937carrera »

You could do what VW did on some of their later cars:

Make an arrangement so that opening the drivers door triggers the fuel pump relay. The fuel system is then always up to pressure when you first crank the key (injection) or the carb bowls are full.
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bigherb
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Re: Alternator issues

Post by bigherb »

The best way is to fit a tachometric relay although not the cheapest, pumps fuel as soon as the engine starts cranking from the coil switching signal.

https://www.ebay.co.uk/itm/New-Fuel-Pum ... SwMvtZSSUu" onclick="window.open(this.href);return false;

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Re: Alternator issues

Post by Paradise City »

Might look into that, thanks.
1981 Air-cooled 2.0l petrol

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Re: Alternator issues

Post by Paradise City »

Thought my fuel pump issues were solved!

Broke down on way to campsite on south coast on Friday.
Luckily it was about 300m from Motorline Engineering in Firle who got me back up and running. The fuse (7.5A) to the fuel pump had blown.

Anyway, got as far as the Norman's Bay campsite (lovely campsite by the way!) with no further issues.

Only got a few miles up the road the next day and the same thing happened. Complete faff taking off the bike rack to get at the engine bay to replace the fuse. 2 more miles, cut out again. I cut my losses at this stage and got lifted by the recovery van to get home.

I don't know what's causing the issue as it's been running fine since installing the new pump up until now. Maybe a short circuit somewhere.

Anyway, I'm going to order a tachometric relay and rewire the whole thing with the fuse up near the glove box so I don't have to worry about accessing the engine bay while stopped at the side of the road.

Anyone else have any issues with pumps blowing fuses?
1981 Air-cooled 2.0l petrol

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bigherb
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Re: Alternator issues

Post by bigherb »

Which electric fuel pump did you fit?
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Re: Alternator issues

Post by Paradise City »

Facet posi flo, 1.5-4psi
1981 Air-cooled 2.0l petrol

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bigherb
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Re: Alternator issues

Post by bigherb »

Paradise City wrote:Facet posi flo, 1.5-4psi
Facets draw less than 3A, Unlikely to be the pump unless there is a short in the pump. Check the wiring routing for chafing against the body.
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Re: Alternator issues

Post by Paradise City »

Going to rewire it with new relay. Hopefully that'll sort it. Otherwise it's probably a faulty pump.
1981 Air-cooled 2.0l petrol

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Re: Alternator issues

Post by Paradise City »

Quick question before I start wiring. On the coil, which is terminal 1 and which is terminal 15?

https://drive.google.com/file/d/1ZREJlk ... p=drivesdk


You should be able to view that now BH
1981 Air-cooled 2.0l petrol

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bigherb
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Re: Alternator issues

Post by bigherb »

The one marked 15 is 15 the other one is 1
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Re: Alternator issues

Post by Paradise City »

Ha ha, should've gone to Specsavers!

Cheers Herb!
1981 Air-cooled 2.0l petrol

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Re: Alternator issues

Post by IAN-H »

Had a similar problem with a Riley 1.5 which was parked up for long spells. I put an electric pump in parallel with the manual pump between the manual pump and the carb. Switch on, the electric pump primes, but once started the manual pump takes over the supply, pressurises the electric pump which then stops, so no complicated wiring. Just wire the electric pump straight to an ignition supply

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Re: Alternator issues

Post by IAN-H »

I' an iriot. I meant in SERIES. Fuel Tank, manual pump, electric pump,
carb
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Re: Alternator issues

Post by CovKid »

Unfortunately the facet electric pump has to be as near to tank as possible. It pushes rather than pulls fuel through.
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Re: Alternator issues

Post by Paradise City »

I think I've found the short anyway which is a relief.

https://drive.google.com/file/d/1GibDFi ... p=drivesdk

Will have to protect the new cables a bit more when rewiring.
1981 Air-cooled 2.0l petrol

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