1990 Mazda Truck B2600 Fuel Problems?

TONYP884

MEMBER
1990 MAZDA TRUCK
4 CYL
2WD
MANUAL
255,000 MILES

My 1990 Mazda B2600 Will start and run for about 60 seconds and then will stop as if it has run out of gas. At that point, it will not start again for several hours. At which time it will again run for about 60 seconds before stalling.
I installed a new fuel filter, the one that is mounted on the firewall. It has a new computer. And the fuel tank ss about 3/4 full of fuel. The Clymer and Chilton manuals are too vague to help. Is there a fuel pressure regulator, or another fuel filter somewhere? A local mechanic said that I should replace the fuel cap and the O2 Sensor?
I'd appreciate your help!
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5 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

When it dies, need to verify good fuel pressure and spark. At that mileage I wouldnt be too surprised if the fuel pump was going out, but need to verify it with a manual pressure gauge

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Saturday, July 19th, 2008 AT 8:38 AM

TONYP884

MEMBER
2 POSTS

I've got good spark. But no fuel pressure when it stalls. If it sits for several hours. It will then start and run fine for about 60 seconds. I was given this truck a few months ago. Prior to this problem, the only issue I had was that under HARD acceleration, it would usually starve for fuel.
Thanks for the help!
Tony P

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Saturday, July 19th, 2008 AT 9:58 AM

2CARPRO JACK

MECHANIC
11,533 POSTS

If no pressure it is going to be the pump most likely, could be the relay, try that first, but like I said, at that mileage the pump is weak at the very least

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Sunday, July 20th, 2008 AT 8:33 AM

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