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Here is a picture of the Bosch pump I found in the tank (sorry, bad pic) :
Anyway, I scored a fuelpressure tester for low money over here in Holland. Luckily for my this unit fits Plug and Play on the fuelrail-schrader valve. So, as soon as the MCX is waking up from her wintersleep, I take her for a ride and watch fuel pressure.
I contacted my friend who owns an fuel service (pumps and injectors)company. He told me that this Bosch pump is probably delivering enough pressure and fuel for the MCX. Otherwise it was impossible that the engine was able to operate at WOT, without hesitation.
Every fuelpump is having an safetycircuit in it, that makes the circuit goes open in case of too much pressure. In other words, this Bosch pump is probably having its safetylevel somewhere at 4 or 5 bar. That appears to be used with 1 bar pressure pumps. With 3 bar pressure pumps, safety level is at about 8 bar.
First I did not believe him, but indeed, at the bottom of the pump, there is a small hole with a little ball in it. I could test it by arming the pump and block the output, but I don't like doing that.
On the other side, on ebay, those AC Delco pumps are going really cheap.
So, I did bite the bullit, and ordered one. As soon as it is on my desk, I will do some tests. I am very curious how long this pump can work without cooling. :-)
Then the problem with the 1/4 tank stalling engine. Hmmm, momently, I have the pump unit apart. So I put the filter in an bucket with fuel, and looked what happened.
Actually, the idea of this system looks good, this could work as an swirlpot, but strange things happened.
First, if I block the little black breather hose. The pot is not filling at all. So the bottom filter need some vent to breath.
Second, fuel level needs to be pretty high before the floater is high enoug to open the intake in the pot. And as soon as outside level is lower than the filter, the pot is soon empty??? I thought that this system with float and a intake what is going open and close should be able to keep a decent amount of fuel in the pot, but that is not the case.... hmmm.
Perhaps if I remove the float it is more easy to fill the swirlpot. Dunno, I have to look into it.
Gert
Anyway, I scored a fuelpressure tester for low money over here in Holland. Luckily for my this unit fits Plug and Play on the fuelrail-schrader valve. So, as soon as the MCX is waking up from her wintersleep, I take her for a ride and watch fuel pressure.
I contacted my friend who owns an fuel service (pumps and injectors)company. He told me that this Bosch pump is probably delivering enough pressure and fuel for the MCX. Otherwise it was impossible that the engine was able to operate at WOT, without hesitation.
Every fuelpump is having an safetycircuit in it, that makes the circuit goes open in case of too much pressure. In other words, this Bosch pump is probably having its safetylevel somewhere at 4 or 5 bar. That appears to be used with 1 bar pressure pumps. With 3 bar pressure pumps, safety level is at about 8 bar.
First I did not believe him, but indeed, at the bottom of the pump, there is a small hole with a little ball in it. I could test it by arming the pump and block the output, but I don't like doing that.
On the other side, on ebay, those AC Delco pumps are going really cheap.
So, I did bite the bullit, and ordered one. As soon as it is on my desk, I will do some tests. I am very curious how long this pump can work without cooling. :-)
Then the problem with the 1/4 tank stalling engine. Hmmm, momently, I have the pump unit apart. So I put the filter in an bucket with fuel, and looked what happened.
Actually, the idea of this system looks good, this could work as an swirlpot, but strange things happened.
First, if I block the little black breather hose. The pot is not filling at all. So the bottom filter need some vent to breath.
Second, fuel level needs to be pretty high before the floater is high enoug to open the intake in the pot. And as soon as outside level is lower than the filter, the pot is soon empty??? I thought that this system with float and a intake what is going open and close should be able to keep a decent amount of fuel in the pot, but that is not the case.... hmmm.
Perhaps if I remove the float it is more easy to fill the swirlpot. Dunno, I have to look into it.
Gert
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