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Join Date: Oct 2001
Location: Lakeland,FL,USA
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Fuel Pressure Problems!!-Need Help!!

Hello,

I have just finsished an engine/trans swap from my rustbucket 74 2.0 Djet into my new Rustfree 76...

Everything worked out fine except-

I am using the 76 pump with the 74 Djet and presure regulator.

I have over 100psi through the fuel lines and the fuel pressure regulator has no affect on the pressure!!

I have been studying the manual and the only thing I can think of is that I am missing a fuel damper that is biult into the 74 pump..

So whats my next Move??

If no suggestions then I will just switch the pumps(76 out-74 IN) but I would really like a solution using the 76 pump!!

Thanks,
Ron
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Old 11-29-2002, 09:38 AM
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You probably have a blocked return line to the tank or have the pump mis-plumbed. Check the diagram in Haynes or Clymer for the right connections. Check your return line at the tank to make certain that you have flow.
Old 11-29-2002, 10:21 AM
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Hello,

The reutn line is not blocked-I can blow bubbles into the tank...

Also I am pretty sure I have it plumbed right..

Flow-from tank to pump-to-passenger side fuel rail-cross to driver's side fuel rail-through pressure regulator-to return line-to tank...

I have it correct by the book so I am not sure why the hell I have 100PSI!!

The only thing that I can is different between the 74 pump and 76 pump is that there are 2 outlets for 74 and the 76 has one...I have studied a clymer manual and fuel damper that I assume is built into the 74 pump...

Any thoughts on the damper...

Thanks,
Ron
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Old 11-29-2002, 10:40 AM
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Could it be the fuel pressure regulator is plugged? Is fuel returning to the tank ? The larger diameter hose is the inlet on a 76 pump so is that how you have it plumbed?
I know that if the return side is blocked the pump will build about 100psi on the supply side.
Geoff
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Old 11-29-2002, 02:48 PM
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Geoff

Hello,

I had not thought about the pressure regulator being blocked....

I know the return line is free but I have not tried to blow through regulator and then listen for bubbles in the tank...

Thanks for the suggestions and I will see if I can determine whether the pressure regulator is blocked tommorow..

Thanks,
Ron
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Old 11-29-2002, 07:25 PM
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I know you've checked everything, but we've all been there and have checked everything ourselves, only to find later that there was one more thing we didn't check!

There aren't too many components in the system: pump, regulator, filter, lines, tank. It isn't the filter. You've checked (and rechecked, right?) the plumbing to the pump, you've got flow at the tank, so it's either the pump or the regulator.

I'm betting either the regulator is faulty or clogged.
Old 11-29-2002, 09:10 PM
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First check that the pressure is first going into the passenger side fuel rail. Then the fuel should go the the driver side fuel rail. Then the fuel should go to the FPR. Check DD drawing to make sure that the FPR is not plumbed backwards (Been there, done that).
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Old 11-30-2002, 04:21 AM
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Where are you taking your pressure reading from? before the FPR or after?
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Old 11-30-2002, 11:26 AM
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Problems??

Hello,

I have it plumber correctly by all the diagrams I have seen..

I have been taking my readings from the cold start valve on the Driver's side rail which would be before the FPR...

My only thinking now is the FPR must be blocked...I was reluctant to test this theory becuase the engine and all components were pulled from another vehicle and installed in my 76 within 24 hours and it worked just fine before!!

Thanks And I will Have News Tommorow,
Ron
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Old 11-30-2002, 02:16 PM
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I vote for the FPR being hooked up backwards.

--DD
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Old 12-02-2002, 08:49 AM
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