Possibilities of overfuelling???????

[mrzigazaga]

Hi Peeps..Something which has really been bothering me..When i had a look under the car i saw that there was 2 Tee fittings..One from the fuel tanks to pump, Which i can relate to as there is no swirlpot, The other was a smaller "T" which was connected to the rear of the accumulator one of which went to the upper passenger side inlet on tank..Now my dilemma is what is connected to the other half of the "T"..If its from the metering head then wouldnt that push the fuel back into the accumulator instead of the tank and leave an inlet open for plugging..And if there is two pieces of pipe going into the tank from the accumulator then where is the feed from the metering head going?..This sounds like the fuel pipes are definitely routed wrongly and the fact that the car will only start when i pump the throttle which is increasing the volume of air coupled with the popping of fuel in the exhaust on revving and the strong smell of fuel when starting and running would suggest that it is over fuelling..This would also explain the low MPG..I have managed to borrow some axle stands so i will be having a butchers today (what another lovely one it is to)..In the middle of the two tanks in the diagram there are five holes..Three of them are taken up by the joining pipes and two are left for 1.Accumulator 2.Fuel distributor return pipe, This is why i think something isnt right, Even the large "T" joining the two tanks can be seen below the chassis line which would suggest too much pipe..If im right then this will be the first thing that i will have acheived to put right the wrongs with my car..I will feel very proud..If not i will feel like a useless numbskull..Wish me luck..I do need it..Cheers..ziga

[mrzigazaga]

Hi Chaps..Had the car up on axle stands and crawled underneath..The small "T" is actually interupting the fuel feed to the pump?..Not sure where its going though and its not the large "T" that is replacing the swirl pot..If it was for a filter it would surely be an in and an out only not a "T"..Either way something has not been routed properly..Ive had to book it into a local garage for wednesday as i havent anything to contain all the fuel in it but hopefully this is the problem..It might also explain why i have to pump the accelerator which induces more air into the mix and the popping of un-burnt fuel in my exhausts..the heavy soot build up in the tail pipes, The smell of raw petrol coming from exhausts when starting and running and the severely low MPG..Cheers.Ziga

PS: If it was from the returning fuel from metering head would this make a difference?..What if there is no fuel to return would that cause an airlock or vaccum.

Edited by mrzigazaga on Monday 4th April 12:16

[jeff m]

Mark, I think you have (or have seen) the schematic for the fuel tanks/pump/accumalator/Fuel dist.

The hose on the rear of the accumalator is not fuel carrying. The accumalator is a piston with a spring, the purpose of this hose is to allow the piston to move freely. If it were not there the piston could not move easily (it would be trying to compress air).
Think of this as a breather.

The return hose from the Fuel Distributor which returns any fuel in excess of your system pressure should go directly to your tank.

Are you sure the hose to the second T do not come from the fuel tank neck? (another breather)

[mrzigazaga]

Hi jeff..Yes ive looked at the schematics and thats what has confirmed it for me..The diagram below shows how mine has been routed, Notice the 2x"T"..One at the bottom of tanks where the swirl pot should be..Obviously to feed the pump but then theres one on the pump line going to the metering head..My concern is what is going into the connection on the tank that is designated for the return from metering head..I will know more on wednesday when i take it to a garage and will photograph and draw how exactly it has been done..I am convinced that this would cause an issue especially if there was no fuel to return from metering head..surely it would create a void..which makes the pump sound like its half submerged, Also there is a bit of a kink in the main feed pipe to the pump which could be restricting the flow..Cheers..Ziga

This is how its meant to be..

And this is mine..

Edited by mrzigazaga on Monday 4th April 21:14