fourtrak fuel pump issue

** GED ** · Posted: Sun Apr 24, 2016 8:18 pm Post subject: fourtrak fuel pump issue

got a mate with a fourtrak and an odd problem.

starts ok untill it gets warm, then wont start at all.

but

if he drenches the fuel pump in cold water it runs fine till it gets hot again.

any ideas?

mike328 · Posted: Sun Apr 24, 2016 9:42 pm Post subject:

diesel stop/start solenoid sticking.

or has he done any work to it recently? mine was a ****** to get all the air out the fuel system I ended up cracking off injectors while it was running Shocked

** GED ** · Posted: Sun Apr 24, 2016 9:45 pm Post subject:

he goes through these like noones business.

he has replaced the solonoid recently, but it has done the same on 2 fuel pumps on 2 vehicles so far, i also know its happened to one of his mates.

mike328 · Posted: Sun Apr 24, 2016 10:12 pm Post subject:

that's weird....were they genuine solenoids? id reckon so as im not sure you can get pattern parts..

Has he been over all the fuel pipes/unions to make sure none suck air when hot?

I would point a finger at fuel (or water in it?) but mine runs on anything I put in it with no problems...

mike328 · Posted: Sun Apr 24, 2016 10:18 pm Post subject:

you do mean it turns over nicely but wont fire don't you? not that it goes all sluggish and wont turn quick enough to fire? not doubting you Ged, just the information you've been given..

** GED ** · Posted: Mon Apr 25, 2016 8:29 am Post subject:

turns over great mate. just doesnt fire.

bucket of water then fires straight away.

Xpajun · Posted: Mon Apr 25, 2016 12:45 pm Post subject:

Auto advance stuck open - it's controlled (when working) by the engine coolant temperature i.e. there should be coolant pipes going to the pump

agrimax · Posted: Mon Apr 25, 2016 12:55 pm Post subject:

When the pump heats up,the outer casing etc expands and creates pressure losses internally.ie the pumping elements and so on have much greater spaces to move in thus not generating enough pressure to open the injector nozzles. Pouring water--should be cool but never real cold as it can crack a hot pump--over it wil lcause the parts to contract back again to give a tighter fit and allow the pump to work again...until it becomes hot again.
Depending on the type of stop valve fitted,take it off and remove the plunger,put valve body back on and start it. See what it does then when hot.If it's the solenoid,it'll still not start and if not the pump needs replacing/overhauled. Don't forget if you can take the plunger out,you'll have to stall the engine.