Technical Fuel rail about 1.4 16v engine

[Mount]

Hello, I've got a small problem and I would like to know your advice.
I apologee if I don't understand you very well, ly engkush is so poor

My car is a cinq 1995 with enter AND return fuel
And I will mount a starjet engine 1.4 16v from grande punto and I will keep the inlet manifold but on the fuel rail there is no return

I think the best idea is to put a punto mk1 1.2 16v fuel rail but I would have confirmation if it's "plug and play" ?

OR is there others solutions ?

 

[StoneNewt]

I don't think the latter 16v injectors mate with the early 16v fuel rail.

Another option maybe using an MPI fuel pump (& fuel tank?) as that uses an in-pump FPR set at 3bar. The only thing to worry about is what the flow-rate of the pump is.

 

[Mount]

I'm thinking about putting fuel rail with injectors from punto mk1 16v on my inlet manifold starjet 1.4 16v

for the fuel pump I've got a palio 75 already

 

[StoneNewt]

Which intake manifold are you using? I'm fairly certain the injectors from a P85 won't mate to the StarJet manifold without modifications & the early manifold won't mate to the StarJet head without a fair bit of work.

The fuel pump I was talking about is from the Mk2 Sei. With the MPI Sei setup the the FPR is in the pump which pressurises the entire fuel system to circa 3 bar. If the pumps flow-rate is high enough then the only major modification is removing the now redundant fuel return line, this to me seems the simplest solution.

 

[randomizered]

THe injectors and fuel rail are not interchangable between the 1.2 16v and 1.4.

You will either have to:

a) fit an mpi in tank return pump

b) use the 1.2 inlet manifold as well as the fuel rail

c) fit a t-piece before the fuel rail, and fit a FPR to dump the excess back before it reached the injectors.

The 1368cc turbos run a return system, and that fuel rail DOES fit the 1.4 inlet, at least im pretty sure it does. I nkow the injectors fit. I have one spare, but try and get one from fiat if i were you. It has a 3.5 bar regualtor fitted to it

 

[randomizered]

This is what it looks like:



I paid £31 for the fuel rail with the 4 turbo injectors. I fitted the turbo injectors into my n/a engine, using the n/a fuel rail as i was getting high duty cycle on the n/a injectors. They have a nice spray pattern and extend closer to the ports.

Kristian

 

[fingers99]

God that's cheap! Where did you get it from?

 

[randomizered]

WOnderful eBay, the only bidder. I didn't post it in auction watch for obvious reasons Taken off a brand new punto abarth that was upgraded to essesse

 

[Mount]

You will either have to:

a) fit an mpi in tank return pump

b) use the 1.2 inlet manifold as well as the fuel rail

c) fit a t-piece before the fuel rail, and fit a FPR to dump the excess back before it reached the injectors.

a) you say that juste for the flow ? I ve already a mpi fuel pump from fiat palio 75hp

b) I've got a starjet engine , I can't put an inlet manifold 1.2 16v, Or I don't undertsand ?

c) its good I think I keep my inlet manifold starjet and fuel rail starjet with no return and I put a FPR before the fuel rail - I've just have to find the good piece

 

[randomizered]

You have to chose a or c then.

a is not just for flow. The pressure in the rail has to be releived somewhere. In the mpi sei pump the return line is IN the tank. This is the easiest and most convinient method for you imho. Just using a 75 pump is no good. It will die a premature death as it will be forcing against a non flowing liquid.

c is possible, but check with the fuel regulator experts first.

 

[StoneNewt]

c) won't work, the FPR is in the wrong place! You'll just pressurise the fuel line to 3 bar and leave the fuel rail at an unknown pressure. You could T off the FPR but you're making things more complicated than need be.

b) I don't think the early manifold fits the engine without modifications

a) NO pressure/flow is only half your problem. To use the starjet fuel rail you need to run a fuel pump which has an FPR in it, basically it is only capable of supplying up to 3bar fuel pressure to the manifold. The MPI Sei' fuel pump does the job, I duno if the palio fuel pump does that or not.

 

[randomizered]

SO that is a only then...unless you swap out the fuel rail for something else (not a bad idea if you can buy what i bought for cheap)

 

[Mount]

oki Understood

If I choose A)

I need the fuel pump AND the fuel line from an seicento 1.1 mpi
perhaps the tank too ? otherwise I will have a hole in my return


right ?

 

[randomizered]

I have never comapred the two, so can't help there im afraid

 

[StoneNewt]

Not having seen an SPI tank I duno how the return fuel line goes into the tank. If it's a barb on the tank it's self you can simply cap off the fuel return with a short length of fuel hose and an end cap. The bigger problem is if the MPI fuel pump doesn't fit into the aperture for SPI fuel pump, though you could probably modify the tank easily enough it's more likely to be easier, but more expensive, to just use a MPI Sei tank.

As for fuel line, as long as the fuel line is rated for 3 bar the original items are fine, you'd just need to remove the redundant line.

 

[Mount]

thanx guys for advices


I will take a look later and make some research for pieces :slayer:


:worship: fiat forum

 

[arc]

c) won't work, the FPR is in the wrong place! You'll just pressurise the fuel line to 3 bar and leave the fuel rail at an unknown pressure. You could T off the FPR but you're making things more complicated than need be.

Not so.

FPR works by bleeding off excess pressure, by T'ing off from the FPR you are not making it any more complex than it needs to be, you're simply installing the FPR. This will leave one (regulated) fuel feed to the fuel rail and then excess fuel pressure will be going back down the return line to the tank.

This is the easiet solution, rather than fitting an MPI pump etc

like so;


The pipe coming into the top of the T is from the fuel pump, one side goes to the fuel rail, the other to the FPR, the FPR vents excess pressure back into the fuel return line.

 

[Mount]

say if i'am right, juste to be sure lol

1. Fuel from the pump

2. return to the pump

3. vacuum, you let it empty with nithing fix ? there is no problem ?

 

[arc]

1. Fuel from the pump

2. return to the pump

3. vacuum, you let it empty with nithing fix ? there is no problem ?

1> Yup
2> Yup
3> It is a vacuum line. If you connect it, then the fuel pressure increases with manifold pressure. With it not conencted, the pressure remains at one set level. I have it connected to the inlet manifold now.

 

[StoneNewt]

Not so.

FPR works by bleeding off excess pressure, by T'ing off from the FPR you are not making it any more complex than it needs to be, you're simply installing the FPR. This will leave one (regulated) fuel feed to the fuel rail and then excess fuel pressure will be going back down the return line to the tank.

This is fine right up until you want to use differing fuel pressures for various reasons. Once you're going that then it's all to easy to get mixed up then the fueling is all wrong, thus the engine goes bang. I've seen this happen both on NOX & forced induction.