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Brandstof meter werkt niet goed - getest - wat nu te doen? : Techniek

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Het is nu 24 apr 2024, 08:09

Brandstof meter werkt niet goed - getest - wat nu te doen?

Alle techniek (mechanisch, elektronisch) zaken horen hier thuis.

Brandstof meter werkt niet goed - getest - wat nu te doen?

Berichtdoor kolvenbag » 17 jul 2022, 15:33

Mijn W108 heeft een OM615, rijdt dus op diesel.

Met mijn brandstofmeter heb ik al geruime tijd kuren. De meter staat eigenlijk altijd op vol, terwijl het leeg lampje dan wel brandt bij b.v. laag peil. Ik heb daarom wat testen gedaan (uit het forum gehaald) om te zien wat er nu precies gebeurt.

Test reeks 1
Ik ben begonnen met het testen op de connector stekker van de Sender. Die heb ik losgehaald om te testen op de 3 contactpunten: 1, 2 EN 3 (of W, G en Aarde). Dat ziet er als volgt uit (zie Test tabel 1).

Test reeks 1.png
Test reeks 1
Test reeks 1.png (168.31 KiB)


Sender checks, cleaning & Test reeks 2
Vervolgens heb ik de Sender unit uit de tank gehaald. Deze heb ik gecontroleerd op bewegingsvrijheid van de floater. Die was redelijk goed en na het glad maken van de midden-as, bewoog de floater nog wat gemakkelijker. Ook heb ik de 3 draden gecontroleerd. Allen zijn verbonden (dus niet gebroken), en de twee buitenste lopen ook door de geleiders in de floater (zie de foto’s).
Hierna heb ik de Sender unit weer in elkaar gezet en de stekker er weer op gezet. Maar nu zonder de Sender in de tank te plaatsen, zodat ik met handbewegingen de floater helemaal bovenin of onderin de Sender kon plaatsen. Dit heb ik vervolgens weer getest: zie Test tabel 2.

Test reeks 2.png
Test reeks 2
Test reeks 2.png (87.17 KiB)


Voorlopige conclusies
- Het tank-leeg indicatielampje lijkt dus goed te werken.
- De meter werkt in de eerste testreeks wel, maar geeft in de tweede test in beide situaties vol aan.

Vraag
a) Wat is er loos?
b) Wat kan ik doen om dit op te lossen?
Bijlagen
W108 Fuel Sender Inside - Floater Right Guidance.JPG
Floater draad rechts
W108 Fuel Sender Inside - Floater Right Guidance.JPG (1.26 MiB)
W108 Fuel Sender Inside - Floater Left Guidance.jpeg
Floater draad links
W108 Fuel Sender Inside - Floater Left Guidance.jpeg (1.24 MiB)
W108 Fuel Sender - Sender Connector Pins & Codes.jpeg
Sender connector pins en aanduiding
W108 Fuel Sender - Sender Connector Pins & Codes.jpeg (2 MiB)
W108 Fuel Sender - Inside Top Connections 2.jpeg
Sender inside connections 2
W108 Fuel Sender - Inside Top Connections 2.jpeg (1.71 MiB)
W108 Fuel Sender - Inside Top Connections 1.jpeg
Sender inside connections 1
W108 Fuel Sender - Inside Top Connections 1.jpeg (1.48 MiB)
W108 Fuel Sender - Inside Floater Bottom.jpeg
Floater bottom
W108 Fuel Sender - Inside Floater Bottom.jpeg (1.29 MiB)
W108 Fuel Sender - Inside Bottom Connections Top 2.jpeg
Fuel Sender inside bottom connections top
W108 Fuel Sender - Inside Bottom Connections Top 2.jpeg (1.34 MiB)
W108 Fuel Sender - Inside Bottom Connections Side 2.jpeg
Fuel Sender inside bottom connections 2
W108 Fuel Sender - Inside Bottom Connections Side 2.jpeg (1.3 MiB)
W108 Fuel Sender - Inside Bottom Connections Side 1.jpeg
Fuel Sender inside bottom connections 1
W108 Fuel Sender - Inside Bottom Connections Side 1.jpeg (1.31 MiB)
W108 Fuel Sender - Connector Bottom-Front side.png
Fuel Sender connector
W108 Fuel Sender - Connector Bottom-Front side.png (120.42 KiB)
kolvenbag
Fresh Boarder
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor RD500sec » 18 jul 2022, 16:06

De vlotter lijkt contact te maken met de weerstandsdraden, controleer dat eens?
Meet eens of het wel weerstandsdraad is?

Met de vlotter bovenin meet je o ohm tussen de G en de aarde. De weerstandsdraad doet dan niet mee, is kort gesloten door de vlotter.
Met de vlotter onderin, meet je twee maal het stukje draad tussen de vlotter en de aansluiting bovenin de aansluiting G en massa, ca 50 ohm, althans zo hoort het.
Meet eens 1 draad, welke de vlotter aftast, van zo hoog mogelijk tot net boven de vlotter, die je dan onderin hebt staan, dan zou je ca 25 ohm moeten meten, de andere draad net zo.

Ik vermoed dat je 0 ohm meet in beide gevallen, dat het geen weerstandsdraad is.
Met vriendelijke groet, Richard
RD500sec
Technisch adviseur
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor kolvenbag » 19 jul 2022, 11:17

Dank Richard, goede info!

Voor de zekerheid over de draden, zoals te zien op deze foto:

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W108 Fuel Sender - Inside Bottom Connections Top 2.jpeg
W108 Fuel Sender - Inside Bottom Connections Top 2.jpeg (1.34 MiB)


Er lopen 3 draden door de Sender, 2 zilverkleurige en 1 koperen.
De vlotter heeft aan 2 (tegenoverelkaar liggende) zijden een uitsparing met daarin een metalen geleider waar de draad doorheen loopt. De 2 draden die elk door een geleider lopen zijn de zilverkelurige draden.

Vraag:
- Is de koperen draad de weerstandsdraad?

"Met de vlotter onderin, meet je twee maal het stukje draad tussen de vlotter en de aansluiting bovenin de aansluiting G en massa"

Vraag:
Bedoel je letterlijk het meten op de draad vanaf het punt waar de vlotter zich bevindt?
kolvenbag
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor RD500sec » 19 jul 2022, 21:55

De zilverkleurige draden die door de vlotter lopen zouden de weerstandsdraden moeten zijn, met het verplaatsen van de vlotter verandert de weerstand, tussen vlotter en bovenste aansluiting, en daarmee de stand van de meter op het dashboard.

De koperen draad is naar mijn idee de draad voor het reservelampje.

Als je de zilverkleurige draden meet, met de vlotter onderin, dan meet je de draden van zo hoog mogelijk tot aan de vlotter.
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor kolvenbag » 10 jun 2023, 17:57

Het is al even geleden, maar inmiddels heb ik dan eindelijk de metingen gedaan voor de sender/vlottter unit.
Dit zijn de resultaten:

Metingen op het connectorblok
Voor de zekerheid ben ik weer even begonnen met de connector en de bekabeling naar het dashboard. Oftewel, de connector losgemaakt van de sender-unit. En de diverse punten in het connectorblok met elkaar verbonden en daarna het dashboard gecontroleerd. Alle indicaties waren zoals ze horen. Hierbij heb ik gezien dat zowel de indicatormeter vol en leeg kan aangeven, en dat het reservelampje brandt en ook uit is. Kortom, deze connector en bekabeling naar het dashboard is in orde.

Metingen op de sender-unit
Deze heb ik uitgevoerd zoals @RD500sec had aangegeven. Dit zijn de 3 metingen die ik gedaan heb en de resultaten.

(1) Met de vlotter bovenin meet je o ohm tussen de G en de aarde. De weerstandsdraad doet dan niet mee, is kort gesloten door de vlotter. Resultaat > Op de G en de Aarde pin meet ik geen waarde (multimeter geeft een 1 weer). Als ik onder het deksel meet (dus aan de bovenzijde van de G en de Aarde pin), dan meet ik 3 Ohm.

(2) Met de vlotter onderin, meet je twee maal het stukje draad tussen de vlotter en de aansluiting bovenin de aansluiting G en massa, ca 50 ohm, althans zo hoort het. Resultaat > 20 Ohm, ook weer gemeten op de contacten onder het deksel, omdat de G en Aarde pin geen waarde geven.

(3) Meet eens 1 draad, welke de vlotter aftast, van zo hoog mogelijk tot net boven de vlotter, die je dan onderin hebt staan, dan zou je ca 25 ohm moeten meten, de andere draad net zo. Resultaat > 12 Ohm, beide.

Comment
Het lijkt dus dat er geen verbinding is tussen de pinnen aan de buitenzijde (waar het connectorblok op gaat) en de bovenzijde van de pinnen onder het deksel (de zijde waar de vlotter beweegt).

Vraag
- Is dit nog te repareren?
- Wat kan ik nog doen?
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor RD500sec » 10 jun 2023, 18:33

Ik denk inderdaad dat je conclusie juist is, en dat er geen contact is met de pinnen buitenop de zender, waar de stekker op komt.
Bovendien, de weerstandswaarde klopt ook niet, het lijkt erop dat een vorige eigenaar zelf weerstandsdraad heeft aangebracht, omdat de oude defect was. (Aanname). Helaas heeft de draad de verkeerde weerstandswaarde.
Het lijkt mij het simpelste om naar een vervangende zender uit te kijken, of je moet uitkijken naar weerstandsdraad met de juiste ohm waarde per meter, deze plaatsen en ook het contact met de pinnen herstellen. (Solderen)
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor kolvenbag » 11 jun 2023, 13:03

Beste Richard, zeer bedankt voor je vlotte reactie.

Ja, ik denk ook dat je gelijk hebt. Deze sender-unit is duidelijk niet in orde.
Ik ga op zoek naar een vervanger (mocht je nog een adres kennen, houd ik me aanbevolen) en misschien dat ik deze defecte dan later nog probeer te herstellen.

Dank!
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor RD500sec » 12 jun 2023, 09:51

Een adres wat mij zo te binnen schiet is Thimo in Krommenie, Tijdeman in Heerhugowaard, maar ik weet niet of dat voor jou in de buurt is.
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor MBreed » 12 jun 2023, 10:40

Volgens mij ook nieuw te krijgen, zowel origineel als van ÜRO. Gebruikt is het natuurlijk allemaal matig.
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Re: Brandstof meter werkt niet goed - getest - wat nu te doe

Berichtdoor kolvenbag » 13 jun 2023, 15:50

Dank beide, voor de tips!

Ik zag al even dat een andere unit snel tussen de €150 en €200 kost.

Kennen jullie ook mensen die zo'n sender unit reviseren?
In mijn geval nieuwe weerstandsdraden plaatsen, en de contacten met de pinnen bovenop herstellen.
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