01pearsonj
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Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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ok atempted to do a veg oil conversion on a 1.5 td today and yesterday. Got all the plumbing done and then started to do the electrics for it all.
Managed to get most of that done with it all working fine switching from 1 tank to the other but my main problem was stoping the main fuel pump.
Tried disconecting the power, fuse and all sorts but it seems that all that goes into the fuel pump is a senda unit live and an earth. Any one have an idea of stoping it or isolating it?
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DAZ1985
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Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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in line switch to the main feed to the pump ?
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01pearsonj
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Registered: 16th Jan 07
Location: Scunthorpe
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dosent seem to be a main feed to the pump? or where i was looking. There were two earths, a blue and red wire and a blue and black wire. The blue and black wire was producing 6v and the red and blue wire had no voltage.
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DAZ1985
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Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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That should be the one then
just put a break in it and try. it can always be reconected
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01pearsonj
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Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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did brake itisconected all wires going to it and still the engine ran. Is the engine drawing fuel from the tank?
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DAZ1985
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Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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just clicked im thinking petrol pump this is diesel. oops
have you got a haynes manual?
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01pearsonj
Member
Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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no not 4 a diesel i havent. The thing im trying 2 get round is, dose a diesel have an electric fuel pump or machanical 1?
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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They're normally mechanical, which is where most of the noise is from.
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DAZ1985
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Registered: 3rd Sep 06
Location: Scholar Green, Cheshire
User status: Offline
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If its in the tank then id say electrical
any were other than that and i wouldnt have a clue to be honest
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dazsri150
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Registered: 7th May 07
Location: south wales
User status: Offline
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on the diesel its mech pump,all u have at the tank is the sender...u need to stop the flow of diesel by fitting a tap or shutoff valve inline somewhere,but u may have issues with air in the system when changing from veggie bk to diesel,,,why not just use the one tank and mix the fuel and oil...
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01pearsonj
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Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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well basicly am running a 2 tank conversion to start up on diesel and then switch to the veg oil when its warmed up. I was thinking of fitting a valve to the fuel line but would this be a problem?
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dazsri150
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Registered: 7th May 07
Location: south wales
User status: Offline
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it shud be ok...give it a whirl and see how it goes,,the only prob u might have is an airlock in the system,which on diesels can cause non running probs...
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01pearsonj
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Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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well we had it all working, switching from 1 fuel to the other and all working fine and then the 6 way pollok valve i was using broke because diesel was trying to get to the engine but was stoped by the valve so it gave way and broke. So i was thinking if there is enough pressure to brake the valve, there will be problems if i fiited some sort of shut off valve in the fuel line.
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dazsri150
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Registered: 7th May 07
Location: south wales
User status: Offline
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Iff u use a tap/valve simllar to wots fitted on hgv airlines u shudnt have a prob,they hold bk 9bar of air pressure...
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01pearsonj
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Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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yeh but would the fuel lines pop off from the engine or tank?
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dazsri150
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Registered: 7th May 07
Location: south wales
User status: Offline
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they shudt ought to as ure basically just shutting the flow of fuel off,and allowing it to take the oil instead..
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01pearsonj
Member
Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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ne idea whats involved of disconecting the machinc fuel pump? was thinking of putting in an electric 1 in
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dazsri150
Member
Registered: 7th May 07
Location: south wales
User status: Offline
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That shudnt be a prob either...just disconnect the mech pump and fit the electric one
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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Remember that the 'mechanical' pump is electric, it's just a diaphragm pump instead of an impellor type.
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01pearsonj
Member
Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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ok so dose the fuel pump actualy suck fuel from the tank?
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01pearsonj
Member
Registered: 16th Jan 07
Location: Scunthorpe
User status: Offline
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ttt
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