A few problems

JB415 · Aug 22, 2017

ram1220 said:
There is one behind the dist. I had to change the one in my 90 Sierra just over a year ago. It's a real $itch to get to.

What was all done to change it? Dist have to come out?

retorq · Aug 22, 2017

That pressure need should be over 10.

Phillip Buessing · Aug 22, 2017

I agree with retorq, fuel pressure too low, you need a pump.

Mikey48 · Sep 19, 2017

JB415 said:
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Update:checked fuel pressure and it's might be my fuel pump.i unplugged the fuel pump relay and the truck still started.so what does that mean

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My 88 was dying and it would not do well when it was accelerating. My fuel pressure was the same as yours and the capacity test was way below a 1/2 pint in 15 seconds. Replaced the pump and it idles well now and accelerates like a new truck. Spent the day under that truck. Need to check the capacity. The pressure should be 5-10 lbs.

c1500deathtrap · Sep 21, 2017

Is that gauge reading 5PSI or am i just seing ****?

c1500deathtrap · Sep 21, 2017

TBI is supposed to have 13 PSI.... but 10 will do. I always replace my pumps with the pump from the vortec or tpi motors. Alot better flow on those. ac delco part #s ep381,96-98ish vortec pumps( my favorite);ep241, TPI pumps;Or maybe ep377, BBC TBI pumps (havent tried these yet).

eyesi · Sep 22, 2017

First, I assume you atached fuel pressure manometer between fuel pump and TBI body, (could you put it in place of fuel filter), there you should get 9-13 psi, not less, not more, this is Regulated pressure.

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Then you check overhead pressure, to doit you pinch momentarily the fuel pressure return line, the one smallest, there you should expect at least 18 psi. Overhead pressure in all fuel injection systems is expected to be 2x Regulated pressure.

A few problems

JB415

Newbie

retorq

OBS Enthusiast

Phillip Buessing

Newbie

Mikey48

Newbie

c1500deathtrap

I try

c1500deathtrap

I try

eyesi

OBS Enthusiast

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