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'89 NA. Runs very badly. Fuel pressure, tested both before and after installing a new Walbro pump insert, measures 20 p.s.i. Now using an official Actron fuel pressure gauge, $40 on sale at NAPA, same results as before with my free Sunpro oil pressure gauge rigged as a fuel pressure gauge.
Fuel pump is triggered by running lilac wire from ECU to ground, so on all the time key is on.
It SHOULD be 3 bar, around 43 psi. I swapped in two different FPRs I had kicking around and same results.
Fuel pump filter basket is from a later car, nylon screen absolutely clean, wiring to pump seems fine, swapped in a different fuel pump relay.
I thought maybe it was a dying ECU but even with fuel pump triggered by jumpering that relay-trigger lilac wire straight to ground, no joy.
I've owned the car about 6 years, drove it about a year fine and parked it. Threw a battery in it recently and it came out of its sleep fine and worked great for about two weeks, then this trouble.
Filled tank once I got it going, this is the second tank of gas in it. Smells and looks fine and it's not the problem.
No kinks in fuel line.
The car's one oddity: Someone in the past eliminated the fuel filter and ran a straight pipe of steel line in its place, somehow got the ends of the plastic lines onto it and clamped it.
I have felt so far, let sleeping dogs lie, car worked fine and I didn't want a mess of leaking gas and figuring out how to connect a filter without either of the banjo ends to bolt up to it.
But my guess now is, the sleeping dog isn't lying any more, it's raging and roaring and making lots of trouble. I now think that's my trouble area; maybe a massive blockage of rust inside the section of steel line?
I'm still leery of gas leaks and how the heck I am going to bridge the area or add a filter if that's what I decide to do.
I have a little chunk of hi-pressure rubber fuel line that came with the Walbro pump, and some fuel line hose clamps, so I guess I'll cut out the steel line, ream its stubs out at either end where they go into the plastic fuel line, clamp the hose onto the ends of the plastic line, then disconnect fuel line at rail, run a little gas into a can to clear any rust or whatever comes down the line, and test the pressure and performance again.
Will report.
posted by 71.173.79...
, Thu, 21 Aug 2014 11:09:58
, Thu, 21 Aug 2014 09:18:11
, Fri, 22 Aug 2014 17:35:49
, Fri, 22 Aug 2014 17:52:19
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