I have 1986 Cadillac deville with a HT4100 V8 that will not start. The car has a new engine with about 3000 miles on at although it has been sitting for about three and a half years. The engine will turn over, I am getting spark from the distributor. It seems that for some reason I am not getting fuel to the throttle body. I have put new gas in the tank, I have poured stabilizer into the fuel just in gas the old fuel had turned into jelly. I am think that possibly the fuel relay has gone bad, but I can find the location of the relay under the hood, I am hoping that it is not the fuel pump...what do you suggest I check? and where is the fuel relay breaker on this car? Thank you Marc

Cadillac DeVille Mileage ' Fuelly

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There are 53 Cadillac DeVilles with reported gas mileage parked at Fuelly. ... Any Submodel, d'Elegance (1), DTS (1), Concours (2), DHS (4), Base (13), Other (32) ... 4 Vehicles; 27 Fuel-ups; 5,215 Miles Tracked; View All 1995 Cadillac DeVilles ... 2 Vehicles; 9 Fuel-ups; 1,664 Miles Tracked; View All 1991 Cadillac DeVilles.

Used 1995 Cadillac DeVille Features & Specs - Edmunds.com

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Edmunds.comFeatures and specs for the 1995 Cadillac DeVille including fuel economy, transmission, warranty, engine type, cylinders, drive train and more.Missing: 100km

Cadillac history 1997 - Motorera

www.motorera.com/cadillac/cad1990/1997/cad97d.htm

History of Cadillac automobiles for 1997. ... 1997 CADILLAC DEVILLE ... Fuel Economy City/Hwy, 13.8 l/100 km - 9 l/100 km (20.4/31.2 mpg-imp) (17/26 mpg US).

Counter-clockwise to loosen, whether it is the flywheel or crank pulley. Use NEW bolts and red Locktite when you reinstall.

thermostat change and radiator cap choose the right one

i hop this can help you and what you went : go to....
http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/21558-obd-i-codes-4-x-engines.html

E26-shorted throttle signal switch
E32-open MAP sensor signal
E70-Intermittent TPS signal
E97-High RPM P/N to D/R Shift

some could be history codes not currents tho maybe try to clear then drive it and see what comes back.
Press off and high simultaneously to clear codes
and this link may help
http://www.cadillacforums.com/forums/ht4100-4-1-4-5-4/21558-obd-i-codes-4-x-engines.html

Sub frame , wires, computer, BCM are all different. A 4.5 or 4.9 engine will fit if you use your intake and gaskets for a 4100.

FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired. Fig. 1: GM (Cadillac) 250 (4.1L) V8 GM (Cadillac) 273 (4.5L) V8 Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: counterclockwise Fig. 2: GM (Oldsmobile) 307 (5.0L) V8 GM (Oldsmobile) 350 (5.7L) V8 w/EFI Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: counterclockwise Fig. 3: GM (Buick) 252 (4.1L) V6 Engine firing order: 1-6-5-4-3-2 Distributor rotation: clockwise Fig. 4: GM (Cadillac) 368, 425, 472, 500 V8 Engine firing order: 1-5-6-3-4-2-7-8 Distributor rotation: clockwise Fig. 5: GM (Cadillac) 429 V8 Engine firing order: 1-8-7-2-6-5-4-3 Distributor rotation: clockwise

It is the engine front cover( from diagram in the 1988 service manual

run the fault codes and check for a problem reverse servo/solenoid

fuel presure been checked with gage?