Not lifting fuel

[baron von ledwidge]

I have just fitted another engine to my 2.25 petrol and it desnt seem to be lifting fuel,  I have re fitted my old fuel pump to see if the new engine had a dodgy pump but no dice, is there anything i could have missed in this, should i fill the fuel bowl.  Sorry if this is s stupid question i just can't seem to get my head round this one
cheers
aaron

[baron von ledwidge]

Just at a thought is it a good idea t free the end that would lift to the carb, would allowing thsi to vent to atmosphere reduce the pressure and help the lift?  Man i hate getitng confused stresses me out no end :p

[Artwigwa]

Just a thinking  :-k , Does the pump prime ok and fill the carb? If so maybe the cam is worn on your new lump and not activating the pump enough?

[baron von ledwidge]

The pump did prime ok out of the car though using the priming handle it doesnt seem to lift much fuel this is why i suspected that it could be an air leak of ome description, or the method i was priming it it,  as it worked the lest time it was used so i cant see how the cam could be too worn,  would a poor seal on the fuel bowl do this? or the seal between the block and the pump though i would imagine this is only an oil seal, and do you think a tow start would help?

[brixworth-alan]

It sounds like there must be an air leak somewhere- if the fuel pump hand primer is struggling to lift, then it'll be a good idea to check the unions of the fuel line with the pump, or it may be a simple as a blockage in the line itself, or in the pickup tube in the tank. Some landies have an inline filter fitted in the fuel line, if you have one this would be the first logical place to check in case its wobbled loose or is gummed up.

Regarding the 'pressure' question, between the tank and the pump the system operates on a vacuum, so any air leaks at all will mean it won't draw. Between the pump and the carb the system is under pressure so if there's a leak, you'll know because petrol will spray out of it. It shouldnt matter if this side of the system is dry, the pump should just push fuel up the pipe to the carb in a second or two, however it might mean you haven't fully primed the pump chamber using the hand prime.

Other stuff to look at: is the air tube to the tank obstructed? When the primer draws a vacuum, it's atmospheric pressure that pushes the fuel up the pipe- and the only place this happens is in the tank.

Hope that helps

[NiteMare]

has yours got the glass sediment bowl ...

make sure the gasket seal is in good condition as an airleak here will stop you lifting fuel

[lightweight-love]

Hey Aaron how r u doing? Hopefully getting the pump filled with fuel for the first time is your problem , If you disconnect the fuel line at the carb and suck on the fuel line whilst u prime the pump it 'should' help fill the pump with fuel then can see if works.
Bonus - tasty tasty petrol! :twisted:

[baron von ledwidge]

Ah thanks for all this, sounds like its as i thoguth and cheers duncan i think ill try and get a mouthfull of fuel later and yeah i will check the seals and that the bowl s tight as i need to get this sorted.  Hows life tho duncan you been up too much and thank you for all your help everyone i will let you know if this works :)

[baron von ledwidge]

Thanks for all the help people, i have taken it all out and i have put it down to a tired pump, i think the valves had stuck open on it, i got it working a bit but just opted for the new pump as there cheap as chips and i figuered it seemed like a waste of effort to have a tired old on one there.  Apparantly i was told the pumps tend to go a bit if they dry out whihc is probably what happened as it worked fine the last time i used it.