2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

S5T2 - Fuel going in to FPR, PD, injectors but nothing coming out return line

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Old Jun 19, 2016 | 08:47 PM
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From: Austin
S5T2 - Fuel going in to FPR, PD, injectors but nothing coming out return line

Not sure what's going on. Car ran fine on Friday. Saturday morning it won't start. Turns over. Doesnt try to catch. No fuel smell from exhaust.

Went thru diagnosis and we have fuel coming out of the fuel filter line that feeds the lines under the TMIC. But no fuel comes out of the return pipe.

Fuel pump activated with the yellow jumper; not with the starter.

This isnt the "JDM lines are reversed" because the car has been fine for 8 years and was fine Friday.

Any ideas? Going to see what the FSM says about testing the FPR

Thanks,

Last edited by vrracing; Jun 19, 2016 at 08:53 PM.
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Old Jun 20, 2016 | 01:40 PM
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From: Austin
Appears to be a failing Walbro. It is only putting out 7psi at the pump. From other posts it seemed that failing Walbro's emit a death scream but this one seems to be going quietly into the night.
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Old Jun 20, 2016 | 02:23 PM
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From: tulsa,ok.
Nothing like figuring it out yourself. Way to go (well, not until the replacement pump is installed).
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Old Jun 23, 2016 | 06:08 PM
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From: Austin
New pump, no joy. Putting a FI pressure gauge on the tank output and capping it and we get like 2psi. Fuel flows, but no pressure. Wondering if its this hodgebodge of fittings. Any ideas on order and orientation?




Thanks
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Old Jun 23, 2016 | 06:30 PM
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From: Austin
Ok, he figured it out while I was posting to the forum. Here is how he did it for future reference as I could find no instructions via Google.
  1. Turn the pump bracket assembly upside down.
  2. Insert the small brown plastic piece with the protrusion pointing into the output pipe.
  3. Put the big brown plastic piece over the pump's output nipple with the slotted end up and the flared end touching the pump body
  4. Put the o-ring over the flared end of the pump output nipple so that it pushes down against the big brown plastic piece.
  5. Insert the pump into the big black rubbery duct on the output pipe.
  6. Push the pump in all the way.
  7. Fasten the bottom metal bracket to hold the pump in place.

Thanks
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Old Jun 25, 2016 | 12:21 PM
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From: https://www2.mazda.com/en/100th/
that o ring setup is weird, it seems to work just fine, but putting it together is not easy, and if it doesn't go together right, it leaks enough there that the car won't run.
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