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| Fuel pump issues (Page 2/3) |
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Patrick
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NOV 09, 09:24 PM
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| quote | Originally posted by tnkgnr:
Guess I'll just drop this thing and replace the pulsator with some submersible fuel line.
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Yes, make sure you get the right stuff... SAE 30R10 submersible fuel line (Gates 27093, NAPA H209)
Don't make the same mistake I made. Have a look Here. 
 [This message has been edited by Patrick (edited 11-09-2020).]
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tnkgnr
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NOV 17, 01:15 PM
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All right, new pump/strainer installed and running. Will start driving it tomorrow and we'll see if the fuses keep popping. I ordered up a Bosch one this time...was pretty nervous since the polarity appears reversed from the original.
 
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tnkgnr
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NOV 18, 11:05 AM
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tnkgnr
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NOV 19, 10:45 AM
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Popped another fuse on the short test drive. Again while taking off in first gear. I disconnected the supply line at the fuel rail and primed the pump - when I did so, the pump was nearly silent...so I'm thinking maybe some sort of obstruction might be in there?
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tnkgnr
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NOV 19, 12:29 PM
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Oof...just did a fuel pressure test - nearly 80psi! Maybe the fuel pressure regulator?
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Patrick
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NOV 19, 01:15 PM
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Does the return line flow freely?
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tnkgnr
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NOV 20, 10:04 AM
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With the return line disconnected, the pump still makes the loud noise and the pressure spikes to near 80psi. The fuel does come out of the return line, but more of a very quick dribble vice the flow from the supply line.
I guess this test confirms that the issue is somewhere in the fuel rail (I suspect the pressure regulator, which should be here tomorrow).
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tnkgnr
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NOV 28, 02:29 PM
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Sigh...got the part and go to replace it and see this - looks like some sort of adjustable regulator, and the new valve doesn't fit that housing.
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tnkgnr
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DEC 30, 05:16 PM
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All right - got the new pressure regulator housing in today and installed it along with a new regulator. When primed it gets to just over 40psi, while idling it's just over 30psi. When I rev the engine it briefly spikes up just over 40psi.
The obnoxious sound has completely gone away, which is great, but the original problem still remains as my test drive blew multiple fuel pump fuses.
Anyone have any ideas? I suspect with an essentially new fuel system throughout there must be a short somewhere that is triggered when I torque the engine (I have installed new motor mounts after developing this problem). I've grabbed and moved the firewall harnesses with the engine running to simulate movement but can't replicate the problem. HELP! What would possibly blow this fuse??
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tnkgnr
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DEC 31, 11:47 AM
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Inspired by posts from 2.5 and Old Lar, I checked the wires over by the relays to wire harness area. Sure enough, I seem to have the same problem where the insulation on the wires was rubbed off from a heat shield.
In my instance the exhaust pipe head shield melted through the plastic covering and then where the shield is stamped together making an edge it cut through the wire insulation. Hoping that fixing this will resolve my issue!
I've removed the portion that was melted in these pics (from above you wouldn't see it, as the top looked normal).
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