Offroad-Express

I have spent a lot of time on the internet searching this with no luck.

I have a 5L in my truck with factory fuel pump (from what I can tell) had a pump of a mid 80s 2lt and thought I would swap the top hats on them so I would have a boost compensator. I have seen a few comments saying that they fit straight on but no real information or pics.

Took the top of the 2lt pump and it all looked pretty straight forward so put it on the pump in the truck.

I have primed the fuel and the pump is definitely full but no amount of turning over the engine with injector lines cracked will get fuel coming out.

With the key on I can hear the fuel cut solenoid doing its thing when I pull the plug in and out.

Anyone done this before or had similar problems?

Things I can think of that might have gone wrong...
1) max fuel screw not lining up with the leaver and not being pushed forward enough (can't work out how I could get the lid on if this was the case).
2)adjuster ring on top of throttle linkage not lined up in the same place. Had to take it off to get one of the bolts out. all I can see this does is another adjustment for max rpm and idle speed. I just set everything to min throttle opening and put it back together
3)something else wrong with fuel cut solenoid
4)air leak? but surely I would get some fuel...

HELP! Might just have to pull the top off again and have another look.

Did you remove the cap off the compensator and the diaphragm / tapered pin?

That is the pin that follows the tapered pin in the boost compensator if its not seated properly it could cause issues...
That's the green pin in the pic...
It needs to be pushed fully in and then the red pin will slide past it...It will stay in when pushed (friction)

Cheers I'll check that. I did pull it out but didn't move the throttle linkage which I think should have stopped it coming out but its a quick thing to to check later anyway.

I would have thought that would make it over fuel and possibly rev a bit high rather than get no fuel at all.

I just hope I didn't have something in the wrong place and bend something etc.

Cheers,
Pete

Well I have done a lot of reading and now know a lot more about how the pump works but am still no closer to getting fuel. Anybody got anymore ideas? Im begining to think something around the fuel cut solenoid but it does click when I put power on it and when the key puts power on it. Anybody know more about these?

I thought it mght be an air lock so put a boat primer pump before the fuel filter to get a bit better priming. I am now sure everything is priming well but still nothing coming out of pump. I am contemplating puting th old top hat on but I can't see how it will help. After that looks like I will be sending it to a pump person.

Cheers,
Pete

there was some info somewhere about changing the spring setup the throttle connects to inside the pump (throttle tension spring??). something about the stock spring fouling part of the boost comp. the 2lt with boost comp used a different spring setup than the non turbo IP's.

Have you tried cranking at full throttle? If you put the throttle 'butterfly' bit onto the wrong spline it may not give any fuel. I've had it before when I have done that and it made full throttle pretty much like idle lol.

tweake wrote:there was some info somewhere about changing the spring setup the throttle connects to inside the pump (throttle tension spring??). something about the stock spring fouling part of the boost comp. the 2lt with boost comp used a different spring setup than the non turbo IP's.

Springs where identical the same but I have seen a pic of a much different one that would foul.

Thanks.
Cheers,
Pete

evilknieval69 wrote:Have you tried cranking at full throttle? If you put the throttle 'butterfly' bit onto the wrong spline it may not give any fuel. I've had it before when I have done that and it made full throttle pretty much like idle lol.

oh yip will give that a go. Did it at half throttle but that could make sense. Will try full.

Cheers

Petemcc wrote:

evilknieval69 wrote:Have you tried cranking at full throttle? If you put the throttle 'butterfly' bit onto the wrong spline it may not give any fuel. I've had it before when I have done that and it made full throttle pretty much like idle lol.

oh yip will give that a go. Did it at half throttle but that could make sense. Will try full.

Cheers

And it lives! Mate you're a champ. Had to take the throttle linkage off to get t one of the bolts holsing on the top had. I thought it was the bottom plate with the spline rather than the top one and didnt mark it. The splined shaft on the 5l top plate had a mark but not the 2lt.When I put it back together I just set everything to min but that was obviously not enough.

Cheers,
Pete

Awesome, good to hear!