Truck dying while braking

[super-gt]

It just started doing this tonight, on a full tank of gas of all things. I have a fuel cell in the bed. It is fed from the bottom area but it isn't sumped. I came up to a yellow light tonight and had to hit the brakes kinda hard. Came to a stop and the damn truck died. Started right back up fine. From my experimenting the only time the truck will die or almost die is if the brakes are applied semi-hard.

My only thought is fuel slosh and that the engine gets starved for fuel when the truck tilts forward enough. Only problem I see with that theory is that I have slammed on the brakes many time before and it hasn't done this until now....Other funny thing is that earlier today I had to get on the brakes kinda hard and come to a stop while the tank was about half full and the truck was fine...nothing happened. I would tend to think the problem would get worse as the tank gets lower, hence more fuel slosh.....I'm freakin stumped.

Any Ideas?

 

[wantingasy]

Re: Truck dying while braking

Maybe your fuel pump is going out :dunno: Hard to say, that's a weird one. Does sound fuel related though. I don't see what else could kill the engine when braking hard. Any sharp kinks in the fuel lines?

 

[super-gt]

Re: Truck dying while braking

Nope...no sharp kinks. The whole fuel system is only acouple months old, so I dunno. I'm just gonna drive it around and see if it gets worse or not I guess. The only thing that had been changed from the time it didn't do it to the time it started doing it is a leak in the fuel system. It had an ever so slight leak around the base of the filler neck. I of course fixed this the other day because the tank needs to be sealed so it will pass emissions. Dunno if that could have caused it or not..

Guess I'll just see what happens :dunno:

 

[kentuc]

Re: Truck dying while braking

I had a similar problem with the V-8. Cleaned the Air Idle Control and that was it. I think it`s from sitting too long with old gas in the throttle body.

 

[super-gt]

Re: Truck dying while braking

Hm.. you really think so? It seems like it would have done it earlier on though. I've probably put like 2k miles on the truck since the engine swap. Think it would take that long to show up?

I had an idea today though. IF it is fuel slosh, it is because the tank isn't sumped. So my thought is that I may put some sort of spacers on the back part of the tank to tilt the tank so it is slanted down toward where it feeds gas to the pump.

No hurt in trying I suppose.

Thanks for the replies guys. :tup:

 

[Zewerr]

Re: Truck dying while braking

Your brake booster doesn't have a big gaping vacuum leak when you slam on the brakes, does it?

 

[super-gt]

Re: Truck dying while braking

Your brake booster doesn't have a big gaping vacuum leak when you slam on the brakes, does it?

Not that I know of. I'm gonna play with it in the morning before I go to work and see if I can find anything. I haven't been able to mess with it since it started doing it the other day. I've been in bed all day long today sick and throwing up so haven't really been up to it.