Fuel Pump Issues

[TeamKrazy]

hi guys,

ok let me paint a picture,

i have a 33, with some mods, and makes some power,

i have a bosche 040 supplying fuel to standard injectors with a stock pressure reg

this is my second bosche pump (will explain in due course)

after about 100kms of hard mtn terrain in the crisp hrs of teh morning, the pump gets very noisy and the car starts to miss.

i stopped and pulled teh pump out,

no signs of anything blocking it, mesh looked nice and clean.

however i did notice that all the fuel in the tank was rather warm, heaps warmer then fuel normally is.

anyway, put the pump back in, filled up with gas and drove on,

about 40 kms further along the drive, same issue started up again. car starts to miss under load, and even at very low revs,

cars becomes completely undriveable

wen i stop the car i hear the very noisy pump whinning like a virgin being broken in by a big black african warrior.

once the pump cools down (i ssume its cooled down casuse the noise stops) it starts to work fine again.

so what do i do?

get another pump, (i sent the last one back when it started to do this)

or is it something else?

any ideas and comments will be greatly appreciated

[raz0r$harP.UK]

I recently got an 040 installed intank in my 33 GTST, to replace the stocker.

Only issue I had is that I couldn't get the pump as far down as the standard one (due to the design of the pickup), but I've got no problems with that because I'm able to keep my car filled to at least a 1/4 tank at all times.

Apart from that, you wouldn't be able to tell it's an aftermarket pump. No extra noise, the car doesn't take any longer to start, and I'm totally happy with it.

[predator]

neil: sounds like its not getting enough current, therefore not working to its full efficiency. Probably the heat is the sign of it working much harder than it should (which like u say will result in a failure eventually)

might have to run some thicker cabling to the pump..

Something to investigate anyhow.

[TeamKrazy]

gordon: never thought of that, might try test how much power its getting.

thanks

warwick said he saw a thread about grounding pumps all time, i could not find it tho

[OVADRV]

mate.i had a similar problem,sounds to me that you have a fuel block,first i would look at your fuel reg pressure,cause of this means if it is blocked or not functioning properly means no fuel is returning back to tank.at this stage fuel pressure is building up in your fuel rail sending too much fuel thru your injectors which floods the spark plugs causing miss.I suggest checking fuel pressure at in take and return.Its happened to me,also happens after 20mins of driving with same symptoms.In my case it was the fuel reg.hope this helps.

[OVADRV]

diagram