engine cutting out uphill

[samcourtney86]

New poster! (less than 10 posts)

Hi, I have a gt turbo 1989 and lately the engines keeps cutting out while driving. It stutters and cuts out unless i dip the clutch and put some revs on, then it takes up again. Seems to only happen under load, and when going uphill. Any ideas what could be causing this?

The fuel pump makes a high pitch humming permantly, is this normal? The main fuel is located under the car next to the fuel filter right? As am I right in thinking theres a second pump somewhere?

Any help is much appreciated!

Sam

[JRP]

Do you have a dump valve mine did similar things going up hills when le diaphragm was split.

Failing a boost leak, carb has muck in it or fuel pumps not getting the juice upto the carb.

[JRP]

Maybe change the filter at same time as checking or removing pump.

Is your mixture screw still ok too?

[bigdavec1974]

You should only really hear the pump when you turn the ignition before starting and only a faint buzz. You can hear the auxiliary pump when you go low on fuel .

[samcourtney86]

New poster! (less than 10 posts)

Thanks for the replies.

The cars completly standard. Maybe a boost leak. Ill try and check that tomorrow. Though it doesnt always do it. I can floor it on the flat and its fine sometimes. Which would point to something intermitent like the pump?

As for the carb, I've got to be honest, ive never dealt with them. I've always dabbled with cars but never carbs so im clueless, but willing to learn!

[samcourtney86]

New poster! (less than 10 posts)

Well Ive changed the fuel pump, and checked theres no boost leaks. I've also took the top of the carb off to check the float and needle valve there. They both look fine and operate freely, but maybe i need to replace this valve? I've put it all back together and it still does it. Im lost. Only seems to cut out on 50% + throttle and when going up hill and/or under load. Also the aux pump seems permantly humming, even though i've a full tank of fuel. Any suggestions?

[Markey Mark (BD)]

When was the last time it had some new spark plugs in it?

[samcourtney86]

New poster! (less than 10 posts)

About 8 months ago. But surely it wouldnt cut right out with dodgy plugs? Maybe missfire?

[Matt@CodeRedMotorsports]

Sounds like the in tank sender unit (under rear seats) has come apart.

[samcourtney86]

New poster! (less than 10 posts)

There is a wierd whirr coming from the sender unit i think. Is this a common fault? Also what is it your thinking may be causing the engine to cut out? Cheers! Sam

[Matt@CodeRedMotorsports]

Cutting out because of lack of fuel getting to the pump.... If the bottom of the sender drops off it won't be supplying fuel to the main pump.
Doesn't cost anything to check.
Lift up the rear seat base, under the black plastic cover is the sender.

[samcourtney86]

Nice one, will check tomorrow and report back. Thanks!

[TopCat]

Sounds like the fuel pressure regulator to me.

[mightymanx]

i had a similar promblem a few years ago with a previous 5 was the tdc lead had melted a bit so id give that a check over :agree: if your not sure with it is it sits on top of the fly wheel cover just follow the wires to the aei make sure they aint melted :agree:

[samcourtney86]

Right thanks, will check the fuel tank sender and TDC lead today. Cheers for all the help!

[samcourtney86]

Thanks for all the help, problem solved!

TDC lead checked, seems this has previously been a problem i think as its been cut and crimped before, but this is ok now.

Problem was the fuel sender gauge. It had come apart like Matt@coderedmotorsports said. The bottom of the unit which has a little filter tab had come off, which was in the bottom of the tank. Everytime i went up a hill i guess this filter tab moved and blocked off the main pick-up supplying fuel, cutting the fuel and engine. Thanks again everyone!

[Matt@CodeRedMotorsports]

;)
Anytime.