Home› Fuel consumption›15–20 kW Diesel

15–20 kW Diesel Generator Fuel Consumption

Manufacturer-documented fuel consumption for 54 15–20 kW Diesel generator sets — median 1.27 gal/h at full load, 0.71 gal/h at half load.

Compare 15–20 kW Diesel generator specs side-by-side →

Consumption by model

Model	kW	gal/h @ 50%	gal/h @ 100%	Tank (L)	Runtime @ 50% (h)
Cummins/Onan 15.0 RDJC	15	—	1.30	—	—
Cummins/Onan DSKAB	15	0.61	1.24	—	—
Cummins/Onan RDJC 15	15	—	1.32	—	—
Generac RA01522	15	0.85	1.37	204	63.8
Generac RD015	15	0.22	0.39	127	149.4
Generac SD015	15	0.71	1.48	—	—
Generac SDC015	15	1.02	1.61	204	52.8
Isuzu MLT 5200	15	—	1.30	212	—
Kohler 15EOZD	15	0.95	1.32	—	—
Kohler 15REOZD	15	—	0.13	152	—
Mitsubishi MLT 5150	15	—	1.30	212	—
Perkins FPE 15 M	15	0.55	0.98	473	225.2
SDMO PACIFIC	15	—	0.45	50	—
Stadco CP15	15	0.11	0.21	—	—
Wildcat Renegade Diesel 15KW	15	0.39	0.70	—	—
Wildcat Power Gen Freedom Diesel 15KW	15	0.39	0.70	—	—
Kubota J313	15	—	0.71	79	—
Caterpillar DE22E3	16	0.82	1.53	66	21.3
Emsa E BD XX 0020	16	0.69	1.24	82	31.5
Kohler 16EKOZD	16	0.53	1.03	—	—
Kubota SQ-3300	16	0.61	1.40	79	34.3
Northern Lights M20C	16	—	1.23	—	—
Northern Lights M844DW3	16	1.03	0.13	—	—
Northern Lights M844L	16	0.82	1.23	—	—
Northern Lights ML844L	16	—	1.23	—	—
Northern Lights NL844	16	0.85	1.23	—	—
SDMO T16UC	16	—	1.11	18	—
SDMO TM16UC	16	0.87	1.40	18	5.5
Lister Petter HSL 24	16	—	0.40	66	—
Kohler 16.5EFKOZD	16	0.69	1.31	—	—
FG Wilson P16.5E2S	16	—	1.35	45	—
Kohler 16.5EFORD	16	0.82	1.48	—	—
Kohler 16.5EFORZD	16	0.82	1.48	—	—
Genmac HSD21	17	—	0.29	23	—
Kohler 17EFKOZD	17	0.69	1.31	—	—
Kohler 17EFOZD	17	0.71	1.24	—	—
FG Wilson PH17.5E2S	18	—	1.85	45	—
Kohler 17.5EFKOZD	18	0.69	1.31	—	—
Kohler 17.5EFOZD	18	0.71	1.24	—	—
Yanmar HYW-20 M6	18	1.03	1.72	—	—
FG Wilson L22E1	18	—	1.32	45	—
FG Wilson P22E2	18	—	1.43	45	—
FG Wilson PH22E2	18	—	1.88	45	—
Kubota J 310	18	0.61	1.40	79	34.3
Perkins 404A-22G1	18	0.77	1.06	—	—
Perkins 404D-22	18	0.77	1.06	3	1.1
Lister Petter LLD 200	18	—	0.50	66	—
Kohler 18EFKOZD	18	0.69	1.31	—	—
SDMO R22	18	—	0.90	—	—
Generac MLT4150MV	18	—	0.59	216	—
Mitsubishi MLG 15	18	—	1.30	—	—
Cummins/Onan 19HDKBV	19	—	1.74	—	—
Simson-Maxwell SKW20 T6-T4	19	—	1.59	158	—
Kubota j324	19	—	0.71	79	—

Figures from each model’s own manufacturer documentation (spec sheets and manuals); runtime = documented tank capacity ÷ consumption at 50% load. Verify against the datasheet for your exact configuration.

Common questions

How much fuel does a 15–20 kW Diesel generator use?

Across 54 models with manufacturer data, full-load consumption runs 0.13–1.88 gal/h (median 1.27); at 50% load the median is 0.71 gal/h.

How long will a 15–20 kW Diesel generator run on a full tank?

At 50% load, documented tank sizes give 1.1–225.2 hours (median 34.3 h) across 10 models.