Jump to content
Ultimate Subaru Message Board

Fuel pressure 1984 1.8 turbo


Recommended Posts

 I am having a problem with the car flooding after running. I can run it and it runs great but if I shut it off it won't restart after a couple minutes. I pulled the plugs and the cylinders are full of fuel. I pulled the vacuum line off the fuel regulator and I'm not getting any fuel in it so I believe the diaphragm is good. I replaced the fuel pump earlier and I'm wondering if it is too high of pressure. I have looked and can't find the fuel pressure specs for this car. Does anybody have any ideas?  

Link to comment
Share on other sites

84GLturbo, on 03 Mar 2018 - 11:17, said:

84GLturbo, on 03 Mar 2018 - 11:17, said:

84GLturbo, on 03 Mar 2018 - 11:17, said:

 There is a regulator beside the fuel pump on the splash plate that has an adjustment on top. Can I dial it down from there?

 

Are you sure that is a regulator?

Definitely non stock.

 

100 psi might not be too high depending on how you hooked up the gauge.

If you just deadheaded the filter output you might get 100.

 

If you teed in the gauge,100 is way high.

The return line may be blocked.Check.

You want about 28 at low idle,43 at full boost.

36 engine stopped or engine running w/FP reg.vacuum line disconnected.

 

My 84 turbo FP regulator went bad very recently.

First symptom I noticed was The regulator seemed sticky.

Sometimes too high,sometimes too low.

Stock is unavailable so I bought one of those adjustable $20 Chinese ebay ones.

https://www.ebay.com/itm/Universal-Fuel-Pressure-Adjustable-Regulator-With-Filled-Oil-Gauge-Aluminum-Blue/261732705229?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

Car never ran better.

So far,so good.

Only complaint is that it does not hold pressure on shutdown very well.

I`m running an onboard gauge now.

Edited by naru
  • Like 1
Link to comment
Share on other sites

 I am trying to get an understanding of the fuel plumbing, somebody may have replaced the lines at some time. The line coming out of the filter from the pump tees off and goes to the rear injectors. There is a crossover to the front injectors and the front ones are plumbed to each side of the regulator and the line on the top of the regulator goes back to the return on the firewall. Does this sound correct? I have tried to find diagrams and am not having any luck. 

Link to comment
Share on other sites

Hard to tell,but,that looks more like a pulsation damper.

Does it have a vacuum line?

If it is an aftermarket regulator,it needs a vacuum line so that it knows when to vary the pressure.

Edited by naru
Link to comment
Share on other sites

84GLturbo, on 03 Mar 2018 - 12:58, said:

 I am trying to get an understanding of the fuel plumbing, somebody may have replaced the lines at some time. The line coming out of the filter from the pump tees off and goes to the rear injectors. There is a crossover to the front injectors and the front ones are plumbed to each side of the regulator and the line on the top of the regulator goes back to the return on the firewall. Does this sound correct? I have tried to find diagrams and am not having any luck. 

 

Hard to tell if you are talking about the regulator built into the fuel rail at the centre of the engine or the "regulator" at the back.

 

The rubber line from the filter goes to the rearmost hardline.NoTees.

The return line from the FP reg, is the upper front one.Is it clear back to the tank?

 

Was the gauge Teed in or not?

 

What pump did you use?

Edited by naru
Link to comment
Share on other sites

That is way too high. Deadheading a factory pump should net you about 60PSI, no more than 70 so the pump you have has too high a pressure rating. The specs Naru gave you are what they should be running. Those injectors weren't designed to seal against that kind of pressure so that's why you're getting fuel in the cylinders. It's also possible that if it were ran at that pressure for long enough, the pintles and seats in the injectors are damaged and won't seal now. Just like Naru said, the line from the FF goes to the rear hard line which feeds all of the injectors. There should not be any T's. Disconnect the supply and return lines from the engine and the tank/fuel pump and blow compressed air through them to make sure they're clear. If they are, hook them back up except the return line at the tank and put it in a can or bottle. Fire up the engine briefly to see if you're getting fuel out the return line and that will tell you if you're hard lines up front are clear without pumping gas all over a running engine. Any T's you find need to be removed. Supply line should go form the tank to the pump to the engine and the return line goes from the engine to the tank. Both are a straight shot. No T's. It's possible someone was screwing around with it and got the supply and feed lines swapped and then tried to 'fix' a problem they created by adding the T's to relieve pressure or that something in the return side is plugged.

Edited by skishop69
Link to comment
Share on other sites

 I am trying to get an understanding of the fuel plumbing, somebody may have replaced the lines at some time. The line coming out of the filter from the pump tees off and goes to the rear injectors. There is a crossover to the front injectors and the front ones are plumbed to each side of the regulator and the line on the top of the regulator goes back to the return on the firewall. Does this sound correct? I have tried to find diagrams and am not having any luck. 

 

Diagram here on page 28 of the ea81 service manual.

http://jdfinley.com/file-downloads/subaru-manuals/

Link to comment
Share on other sites

FYI, these are the same injectors used on turbocharged Datsuns in the 80's, but Subaru ran them at a lower fuel pressure, 36 psi instead of the industry standard of ~43 psi.

 

The pressure regulator in in the engine bay, the device down on the fuel pump shelf is a pulse-dampener.

Link to comment
Share on other sites

That pump is not the problem.

Looks fine.

 

All of the aftermarket pumps for this application look exactly the same to me regardless of the brand name applied.

All have the same specs too.

I suspect they all come from the same Chinese factory.

Edited by naru
Link to comment
Share on other sites

 I ran new lines and they all match the diagram. I made a tee with my gauge and it is 50 lbs with just the pump on and just under 40 when cranking. The pressure bleeds right off when just the pump was on but it holds around 40 when cranking and holds it until I cycle the key back on then bleeds right off. Wouldn't start and when I pulled a plug the cylinder had a lot of fuel in it. I verified we had spark afterward also. 

Link to comment
Share on other sites

That fuel pressure is still 10 psi high.

Could be the problem right there.

I noticed mine started to idle bad at 40-50 psi.

 

Try again w/dry cylinders and plugs.

 

I`ve tested my injectors for leaks by removing them from the heads but keeping them attached to the pipes.

 

Or you can block the return and supply lines w/pressure on the gauge.

If it drops,the injectors are leaking.

Edited by naru
Link to comment
Share on other sites

You need to find the troubleshooting diagrams for the EA81T and follow those.

 

Why?

Which diagrams are those?

 

I don`t know of any relevent ones.

Most of the FSM troubleshooting trees are crappy or just obvious stuff anyway.

Link to comment
Share on other sites

 I plugged the return line on the reg and bumped the pump with the gauge teed in. It started at 50 lbs and I left it overnight, about 17 hours and it dropped to 35. I can't see that little bit of leakage flooding the motor. I have spent a long time looking for troubleshooting diagrams and the ones I have found really don't tell you anything.

Link to comment
Share on other sites

 Well I just pulled off the distributor cap and nothing. The damn timing belt must have broke.... I had spark a couple days ago so it must have happened since then. Guess its time to get dirty, any advice?

Link to comment
Share on other sites

Your FP regulator is not working.

50 psi is too high.

 

There is a small chance the return line is open,but,restricted.

I would direct the return into a fuel can instead of the tank to see if it makes any difference.

 

Only other possibilites are an inaccurate gauge(seems unlikely) or an overpowering pump(its not). 

Link to comment
Share on other sites

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
 Share

×
×
  • Create New...