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Ed,
Our Haynes books must be different editions. Mine has the LH 2.2 diagram on 4A-28. It shows item "F" (25 amp fuse) between the battery and the relay. So the pump (and system) are fused, and the diagram appears to be correct for LH 2.2., except that in the U.S. it lasted thru '88—not '86 as the caption reads.
My page 4A-29 has the LH 2.4 diagram as you described. Compare it to Art's LH24_1.jpg, and you'll see the fuse wiring is as I described, where only fuse 4 plays a part. The caption is also wrong (for U.S. cars). Our LH 2.4 began with the '89 and continued till the end in '93. So Haynes must be showing a Volvo functional diagram for a European spec car ( a typical Haynes touch, IMO.) Nice catch on the missing 25 amp fuse.
" It also occurred to me that, if the power to the FI and ignition control units really did go through fuse #6, then there's no way the car would start or run with fuse #6 out. So, the published fuel pressure relief procedure can't be correct." (I think that's where I came in.)
Art and I have discussed these "functional" diagrams before. My opinion is that they are more apt to have errors than the "back-of-the-book" diagrams he mentions. You'll see those in your Bentley, and will find they too have a few quirks. Just post your questions as needed.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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