Fuel tank question

[muttleypup]

Is there an internal filter/strainer in the fuel tank near the outlet that could get blocked? Did some work on fuel system at the weekend and when I disconnect at the tank i get no fuel running out, though truck drives ok so fuel is being pumped. Don't think it's a vent pipe issue as it's the same with the fuel cap off.
Wondering if it's new tank time or nothing of major concern.

[AngeloEvs]

if there is fuel it should drain, there is no internal filter as such (as far as I am aware) only an external one close to the outlet normally. How full was the tank and was the van jacked up in a such a way that fuel was not able to drain?

[muttleypup]

Tank is about half full, wasn't jacked up but drive slopes slightly/truck sitting sloping backwards so should have drained I'd have thought? Tried a small 12V compressor on the outlet and with the fuel cap off air can be heard bubbling in tank but still no fuel out. Odd because it starts/drives absolutely fine but it is bugging me now!

[AngeloEvs]

I would try pushing something of a smaller diameter into the fuel outlet pipe and repeating. It is strange that it runs fine but if the tank is half full it should drain.

[muttleypup]

I did poke a thin screwdriver in about 4/5 inches, made no difference. Didn't want to poke too far as I wasnt sure if there was anything inside the tank that could be damaged. It is a strange one as it primed up on a hand primer with no issue and runs 'as normal'. I'll have another look at it later this week but any suggestions are welcome.

[Oldiebut goodie]

The last heater that I fitted (petrol) was exactly the same - fuel in the tank but no fuel ran out other than a little spillage when I fitted the tee-piece at the tank spigot. It had no adverse effect on fuel flow to either the engine or the heater.
I remember a cutaway photo was put up on the forum a while ago but can't find it now. Found it - http://forum.club8090.co.uk/viewtopic.p ... e#p8144461

This explains how the fuel doesn't flow when the tank is low.

[muttleypup]

Fantastic! Thanks for finding/posting that, puts my mind at rest, or at least slows it down a bit