Post-Ceasefire Hormuz Disruption Is Still Hitting Shipping Through Bunker Fuel Stress in Singapore

The Strait of Hormuz crisis has moved into a new phase for shipping: not a simple transit shutdown story, but a lingering marine-fuel logistics problem. Fresh reporting on April 15 indicates that bunker fuel is still available in the market overall, but availability is uneven by grade and increasingly concentrated at major Asian refueling hubs, especially Singapore, even after the April 8 ceasefire raised hopes of a broader normalization. That matters because bunker stress can continue to disrupt vessel rotations, speed decisions, bunker calls and freight economics long after the worst chokepoint headlines fade.

The disruption did not end with the ceasefire

The immediate Gulf transit shock may have eased from its most acute phase, but the fuel system feeding Asian shipping has not snapped back into balance. Earlier in the crisis, Reuters reported that disrupted Strait of Hormuz traffic and shipper caution were already expected to curtail bunker supply in Singapore, with Energy Aspects warning on March 3 that extended disruption would hit the city-state’s fuel availability directly (MarineLink/Reuters).

That risk is now showing up more clearly outside the Gulf itself. According to S&P Global Commodities at Sea data published April 7, Singapore bunker demand rose to an estimated 4.99 million metric tons in March, up 12.6% year over year and 8.2% from February, as more ships turned to the world’s largest bunkering hub while Middle East routes remained disrupted. The number of bunkering events climbed to 9,355 in March from 8,951 in February.

That increase in traffic did not mean the market was comfortable. The same S&P Global report said supply conditions had effectively tightened even though overall supply still appeared sufficient, because volatility and steep backwardation discouraged traders from carrying inventory. In other words, availability was not simply a question of total barrels in the system; it was a question of whether the right grades were available at the right time and on workable delivery terms.

Why Singapore matters so much

Singapore is not just another regional bunker port. It is the principal marine refueling hub on the Strait of Malacca corridor and a key operational stop for container ships, tankers, bulkers and other deep-sea vessels repositioning between Asia, Europe and the Middle East. When bunker availability in Singapore becomes uneven, the effect can ripple far beyond Gulf-linked cargo.

The Maritime and Port Authority of Singapore has tried to reassure the market. S&P Global cited MPA chief executive Ang Wee Keong as saying on March 25 that “the flow of goods through Singapore has remained stable in recent weeks, and there is adequate bunker supply to meet the industry’s demand.” It also noted an earlier MPA statement on March 13 saying the authority had “not observed any significant changes to ship arrival schedules in the Port of Singapore” (S&P Global).

But “adequate” has not meant friction-free. Singapore-based participants told S&P Global that bunker availability tightened as traders reduced working inventory. The result is a market where ships can still fuel, but not always with the same flexibility on grade, timing or price that carriers would expect in a stable operating environment.

The core problem is grade mismatch, not just absolute shortage

The most important operational detail in the current phase is that bunker stress appears to be uneven by fuel type.

March data compiled by S&P Global showed Singapore bunker demand split roughly between low-sulfur fuel oil at 2.46 million mt, or 49.5% of sales, high-sulfur fuel oil at 2.12 million mt, or 42.5%, and marine gasoil at 400,000 mt, or 8% (S&P Global). That breakdown matters commercially because different vessel classes and compliance setups do not have the same fuel flexibility. Scrubber-fitted ships can lean into HSFO. Other vessels need compliant low-sulfur grades or marine gasoil, which can be tighter and more expensive during dislocation.

Market reporting through March repeatedly pointed to stronger stress in distillates and low-sulfur grades. Manifold Times, citing ENGINE’s East of Suez bunker outlook on March 24, said Singapore’s low-sulfur marine gasoil pricing remained elevated amid tight supply, steady demand and uncertainty in Fujairah, with displaced demand redirecting toward Singapore. Earlier in March, Ship & Bunker reported traders describing marine gasoil availability in Singapore as “extremely tight,” even while VLSFO and HSFO availability was somewhat better.

Wood Mackenzie, cited in VesselTracker’s March 24 market summary, said cargoes from Kuwait’s Al Zour refinery, an important source of ready-blended 0.5% sulfur fuel, were unable to exit via the Strait of Hormuz. That helps explain why the market can look supplied in aggregate while still struggling in specific compliant grades.

The numbers show why bunker economics remain unstable

The price signal in Singapore also shows why this is still an operational issue and not just a commodity-market footnote.

According to S&P Global, Singapore-delivered 0.5% sulfur bunker premiums against the FOB Singapore 0.5% marine fuel cargo benchmark averaged $78.49 per metric ton in March, up from $21.40 per metric ton in February. Delivered HSFO premiums averaged $63.86 per metric ton in March, versus $8.53 per metric ton in February (S&P Global).

Argus reported on March 11 that Singapore’s VLSFO premium to Panama had swung from its historical discount to a premium that reached $313.25 per metric ton on March 9. On March 10, Singapore’s MGO premium to Panama was $474.50 per metric ton, while its VLSFO premium was $214.25 per metric ton and HSFO premium was $145 per metric ton (Argus Media). Argus also said suppliers were requiring lead times of at least five days as HSFO, VLSFO and MGO all tightened.

Those spreads matter for shipping operations because they shape where owners want to bunker and how much fuel they are willing to take in any one port. When price gaps widen sharply between hubs, vessels may try to minimize liftings in expensive Asian locations and maximize volumes elsewhere, which can alter routing economics and occasionally push bunkering demand to ports that are cheaper but less convenient.

The strain is no longer isolated to one port

Singapore is the clearest signal, but not the only one.

ENGINE’s March 24 East of Suez outlook said Japanese bunker supply was under severe pressure, with major domestic refiners cutting marine bunker volumes by about 50% starting in April and spot availability across key hubs becoming effectively inquiry-only in many cases (Manifold Times/ENGINE). Earlier in March, OPIS reported that East Asian bunker shortages were pushing some VLGCs south to Singapore to refuel, while some suppliers in Hong Kong had stopped offering VLSFO until further notice (OPIS).

That broader regional tightening is part of the reason Singapore has become so important in this phase of the story. The market is not dealing with a single-port outage. It is dealing with a reshuffling of fuel demand across Asia at the same time that product flows from the Gulf remain impaired and some alternative regional sources are constrained.

What this means for container lines, tankers and bulk shipping

For container carriers, bunker instability mainly shows up in schedule recovery and network cost. If prompt stems are harder to secure, or only available at a premium, carriers may have to change bunker call timing, adjust sailing speed or accept more expensive fuel in order to hold service windows.

For tankers, the issue is more directly linked to voyage economics and ballast decisions. S&P Global noted that some participants expected bunkering volumes to soften later as tanker owners ballasted west amid limited cargo opportunities in the East and Middle East, a reminder that fuel-market dislocation and cargo-market dislocation are now feeding each other.

For bulk and project cargo shipping, the risk is less visible but still material. Bulk carriers accounted for 2,630 bunkering events in Singapore in March, the largest single vessel segment in the S&P Global dataset. When bunker lead times stretch or grade availability becomes less predictable, operators may face narrower windows for coordinating heavy-lift sailings, industrial cargo transits or weather-sensitive project moves.

What remains uncertain

The most important unknown is how quickly Gulf product flows normalize in practice. The April 8 ceasefire reduced expectations of continued acute disruption, but physical fuel systems typically recover more slowly than headline risk. Damaged infrastructure, tanker repositioning, insurance caution, altered trade patterns and refinery output decisions can all keep supply chains out of balance after hostilities ease.

There is also a timing issue in the public data. Singapore’s official March bunker sales and tanker-call figures, released by MPA on April 14 and reported by The Straits Times, showed about 4.8 million tonnes of bunker fuel sold in March, up 1.9% from February, and 2,302 tanker calls, up 10% month over month. But market watchers quoted in that report cautioned that March figures still reflected cargoes and vessel behavior from the earlier phase of the crisis, suggesting April data may offer a clearer view of whether post-ceasefire normalization is real or only partial.

Why this follow-up matters now

The key lesson from the April 15 reporting is that shipping’s Hormuz problem has widened from direct passage risk to secondary fuel dislocation. The market appears to have enough bunker fuel in aggregate, but not enough normality in grade availability, pricing, replenishment and regional distribution to treat the crisis as over.

That distinction matters. A vessel does not need a total fuel shortage to face operational disruption. A delay in securing the right grade, a forced deviation to a different bunkering point, or a premium that changes the economics of where to fuel can all translate into slower schedules, higher voyage cost and more uncertainty across Asia-Europe, trans-Pacific and other long-haul networks.

For CAP Logistics readers, the practical takeaway is that even cargo with no direct Gulf port exposure can still feel the aftereffects of the Hormuz crisis through vessel fueling decisions, schedule slippage and cost pressure at major Asian hubs such as Singapore. This is the kind of second-order disruption that can quietly affect transit reliability for industrial and project shipments after the headline crisis appears to cool.