Why is my GMC Safari hard to start, or why does it crank but not start?

Short answer: On the 4.3L Safari, a van that's hard to start after sitting but fine the rest of the day often has a leaking check valve in the fuel pump, so fuel pressure bleeds off overnight. A quick test: turn the key to Run for two seconds, off, and repeat several times before cranking. If it then starts right up, that's your sign. A van that dies and then won't start at all needs a fuel pressure and spark test. A member said these vans are known for eating fuel pumps.

Symptom: After sitting overnight it cranks a long time before it starts, then starts fine for the rest of the day. Or it shut off at a stop light and now cranks normally but won't fire.

What to check first

1. Try the key-cycle test. Key to Run for two seconds, off, six times, then start. Starting right up points to fuel pressure bleeding off.
2. Have fuel pressure tested with a gauge, and watch whether it holds after shutdown.
3. Listen for the fuel pump humming for a couple of seconds when you turn the key to Run.
4. Check the fuel pump fuse and relay.
5. Check for spark if pressure is good.

Likely causes

1. Fuel pump check valve leaking. The key-cycle test worked for the 1999 owner. The check valve is in the tank, and some assemblies are only sold as a unit.
2. Failing in-tank fuel pump. A member said these vans are notorious for eating fuel pumps, and the gauge often starts acting up too.
3. Fuel pump relay or fuse. A quick check before dropping the tank.
4. Ignition problem (no spark). Starting fluid didn't help the 2000 van, which also calls for a spark check.

What it usually costs

No owner posted prices in these threads. A relay is cheap; a fuel pump assembly means dropping the tank, so labor is a big part of the bill.

Is it safe to keep driving?

A van that dies at a light is a crash risk and can strand you. A hard start after sitting is less urgent, but it usually gets worse as the pump fails. Verify with a mechanic.

DIY or shop?

DIY for the key-cycle test, relay and fuse. Dropping the tank for a pump is a big job that most owners leave to a shop.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists no recall for fuel or starting on the GMC Safari for these model years (checked 2026-10-27). Other recalls may exist for your car, so check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: No recall we found matches this problem, so it's a normal repair, not a free recall fix. Still run your VIN, since other recalls may be open.
• NHTSA complaints: 229 keyword-matched complaints for GMC Safari 1995–2005 (of 882 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-27; keywords: no start, no crank, click, starter, ignition switch, stall, dies, hot, restart, fuel pump, hesitation, pressure). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 1999 Safari van doesn't start well on Car Talk, a van that cranked well but was slow to start after sitting overnight got a suggestion to cycle the key to Run several times before starting. The owner tried it and it started on the first try, which points to the fuel pump check valve. Another member said these vans are known for eating fuel pumps and to replace the whole sending unit.
• In GMC Safari 2000 VAN won't start on Car Talk, a van shut off at a stop light and then would crank but not start. Starting fluid didn't make it fire, and members said to follow a proper no-start check for spark and fuel on the 4.3 V6, which uses a timing chain, not a belt.
• In 1999 GMC Safari will not run on Car Talk, a 130,000-mile 4.3 Vortec wouldn't run even with new plugs, wires and filter. A member asked whether starting fluid made it fire, whether the injectors were clicking, and whether the spark timing was near the mark.

Quick tip

Do the key-cycle test before you buy anything. It's free, and it tells you whether the problem is fuel pressure leaking down overnight.

Vehicle focus: 1995–2005 GMC Safari (Chevy Astro twin), 4.3L V6.

Safety / mechanic note

Fuel system work is a fire risk. Relieve pressure before opening lines, and don't smoke or work near sparks. Verify with a mechanic.