Poorly syncro diesel

[monekynuts]

Can anyone here tell me how many ports for fuel lines there are on a 1988 diesel syncro fuel tank.
I took a bodged and leaking aux fuel tank off my van a few weeks ago. It had two electric pumps and t pieces into what I believe is the feed from the base of tank. The other from the return from pump.
Anyway van has sat for a number of weeks waiting to be taxed in June. Anyway started it yesterday but it,s making a dry grinding screeching noise from one of pulleys and won't rev past 1500/2000.
I'm worried I've cocked something up with fuel. Although all I did essentially is removed t pieces and put in straight pieces. The van has a 1.9 aaa I think.
It looks like feed comes from very bottom of tank through filter to fuel pump then return from pump goes into top of tank. Am I right or is there more to it?

I.ve yet to try fuel filter timing etc. But wanted to clarify fuel flow first. It ran fine after removing aux tank.

[ninja.turtle007]

Feed is from bottom of tank and return is on the left side next to fuel sender. Plus there are two float valves on top of the tank. The breather hoses loop around the top of the tank and terminate just below the fuel filler cap.

[monekynuts]

Thanks for that. I've just been tinkering again. I can see the feed at base going into filter and then return from pump going in next to sender as you say. I've checked the turbo intake off and can move turbine and revving it up it's turning. I'm still of the opinion it's a fuel issue. There is a collection of small bubbles in clear feed pipe. When rev engine I can see these more bubbles apparently coming back from pump to forwards filter.
I.ve yet to check timing but this has not been touched.

[lloydy]

if its been standing, is there a chance fuel has drained back, esp as your getting bubbles? You might just need to bleed the fuel system

[monekynuts]

I've been having same thoughts I'll stick some fresh diesel in a new filter and bleed it. Once it's running well ( hopefully) I'll check timing as well. I'll let you all know how it turns out. I'd have thought air in system would cause non start rather than no revs. It ticks over lovely.
However the fuel filter looks years old. I'm just hoping the occasional screeching isnt pump on way out.

[monekynuts]

I've been tinkering much to annoyance of neighbours. Just cracked each injector pipe in turn and get pulsing spraying diesel and engine starts to rumble. As soon as tighten engine ticks over fine. I undid the drain on underside of filter and loads of watery diesel comes out. However there is loads of air in feed line and van won't rev at all now. New filter in morning me thinks

[monekynuts]

I really need some advice now. I have fitted a new filter. No difference. There seems to be a lot of air in the clear feed line. When revved as much as it will allow 1500 the air is slowly drawn in to pump as soon as it's ticking over air emerges again. The van ticks over lovely. Ive cracked each injector repeatedly if makes no odds other than running on 3 once line undone. Quickly returns to 4 once done up.
I put the feed pipe in a tub of fresh fuel and still the same.

I'm beginning to think the pump has gone it make explain the screeching from one of the pulleys I'm thinking.????

I'll bring some tools home tomorrow and check pump timing but as nothing has been touched I fail to see how this can just go out. Anyone got any suggestions or have I answered my own question. Pump?

[kit]

Sorry if the sounds stupid but air is getting in before the pump, are you sure all the connections are tight?

[monekynuts]

I don't think so. I've run it from a container of diesel and still the same. I'll try it again once I get some more time. If its running from feed pipe straight into clean diesel where else could it draw in air from

[kit]

Not that this is likely to help in this instance but fit a non return valve between the pump and filter this has made a big difference to fuel running back ect in my case.

[monekynuts]

I've got a non return valve but need to sort out the issue first. Once resolved I will fit valve to assist starts when the van is stood

[monekynuts]

Well just a quick update. I removed the pump and took it to a well respected diesel specialist. He bench tested the pump and couldn't get it to rev past 1300. The pump delivering a fraction of the pressure it should. It was stripped rebuilt with new parts re tested. I refitted it last night and started first time and runssweet and revs all the way to red line.
The guy i use said the oump internals were gummed up with vege oil. The previous owner had commented he had run it on a 50/50 mix.
Oh well £250 later she is running spot on. Very pleased.....