Problems with fuel supply

[Grovewood]

Hi, I have 1989 crossflow its giving me a few problems with the fuel supply when i drive it after about 15min it starts to choke it slows down to almost stopping then slowly it starts again and goes for a few mils and does the same again, could it be the carburetors or a blockage in the fuel line, (i fitted a new fuel filter) has anyone come across this problem any advice would be appreciated thanks in advance.

[SM25T]

Is it supposed to breathe through fuel filler cap ? If so ... maybe this is blocked ? Is there an inrush of air if you remove the cap when problems arise ?

[Grovewood]

Thanks for that i give it a go this w/end

[Grovewood]

Hi, i haven't solved my problem?,i think it maybe the fuel pump it tends to stop going up hill when i turn it around it goes again until the next hill, would gravity keep a car going on the flat?, i going to order a new pump a give it a go unless someone has any other suggestions, Thanks in advance.

[Jonathan Kay]

Could the hill effect be due to it needing more power to go uphill?

Did you try unscrewing the filler cap when it happens?

Jonathan

[Piers300]

In the 80's, Caterham had some issues with some sort of fuel tank sealant getting sucked into the fuel line and causing problems. I had it with my 85 Super Sprint many years ago and managed to remove a hole load of sealant.

Disconnect both ends of the fuel line and use an air line from the engine end to clear the line out. A foot pump will also work, which is what I used.

Also check you have no in-line fuel filter that is blocked.

 

Piers

[virden]

Tony,

I had a similar problem, which  caused the engine to die and then cut out, we traced it to a faulty coil.  It got very hot to touch which I am told is a sure sign of failure.   Another possible long shot is that the  throttles are briefly sticking open, flooding the engine.  I had this due to the nipple at the top end of the throttle cable becoming dislodged which prevented the cable returning until my foot was completely off of the pedal.

 

Good luck

[Nigel Riches]

My uncle's Cortina had a similar problem years ago, turned out to be the silencer internals had collapsed, causing a blockage, so, no fumes out = no fumes in, and after a while the system would clear, and off down the road for another few kilometres, new silencer sorted it. 

Regards, Nigel. 

[Grovewood]

I may have solved the problem, i fitted a new fuel pump and disconnect both ends of the fuel line and using a air line to clear (as Piers suggested) the fuel line, i went out for a quick blat fingers crossed it went ok, i want to thank all of you for your suggestions they have been a great help, Merry Xmas to all.