1995 Chevy Astro 1995 Chevy Astro van will not start witout

I have put seafoam in the tank with only 10gallons of gas in the tank then ran the engine pretty hard it had no effect on the issue the van still runs like a pistol.

I ordered a pressure checker yesterday should be here anytime now (NAPA) I only have a obd2 tester not 1 the fuel pressure tester is cheaper today. Tomorrow I may need the obd1 tester.

Thank you for responding

Update

Here is the skinny

With fuel pressure gauge
Turn on ignition pressure goes to 52 psi engine won't start.
Turn on ignition pressure goes to 52 psi leave ignition on watch PSI drop to 30psi in 15 minutes.

Turn on ignition pressure goes to 52 psi engine won't start. Spray MAF cleaner in throat it starts runs at 52 psi all of the following tests were started using MAF cleaner

Next try pinching shut the return line start van, pressure slowly climbs to 79psi that was after I pressed down on the accelerator. Otherwise it was stable at 52 psi but running rough WITH the hose still clamped I turn engine off Psi drops form 79 to 66 in Five minutes.

Next try pinching shut the return line, start van pressure slowly climbs to 79psi that was after I pressed down on the accelerator. Otherwise it was stable at 52 psi but running rough. Turn off engine remove clamp quickly. Went from 79 to 60psi just like that. Then bleeds down 60psi-48psi in 5 minutes.

Turn on ignition pressure goes to 52 psi try to start see PSI dropping to 45 over 5 seconds of starter turning. Start using Maf cleaner let engine run PSI holding at 51-52.
Turn off engine clamp return line quickly. PSI goes 50 -10 psi in 15 minutes.

Then I take it for a drive starting as before go to the parts store. Leave parts store turn on ignition PSI goes to 59-60 van starts. Go home try again 12 more times over 10 minutes PSI is at 59-60psi just turning on ignition

I just do not get it. It will start at 59-60PSI won't start at 52PSI I have read 51-64psi is required. Oh and lastly the van is running at a steady 52 psi once started

I still do not get how all of a sudden after 8 days it is working again, not to say I won't go downstairs and not start after I send this.

Brilliant! Clamp off both hoses if it does go down then it is not the fuel pump. If it does then it is the regulator or Then again you added injectors; I thought I was home free on the regulator oh well.

I took today off on this, said enough just rest. I will try both hoses tomorrow Monday.

Oh it did not start this morning I had about 55-56Psi at 59-60 psi it started every time

Thank you!

Okay help me out here.

The fuel pump is before the regulator Yes?

The pressure should be at 60-62 before the regulator Yes?

The regulator has no effect on adjusting the fuel pump pressure correct?

It should be a constant yes? Especially with pump on but the engine not running.
The regulator just controls what goes into the engine correct?

The regulator is not called into action until the ignition sequence Yes? Or am I off here?

So when you turn on the ignition to power up the pump but not start the van it should be at pressure 60-62 yes?

So when I turn on ignition and it only goes to 52 PSI then try to start it drops to 45 psi
Would that be the fuel pump and not the regulator or injectors?

If the injectors were leaking or the regulator was leaking you would think there would be fuel in the engine to start the van instead of me needing MAF cleaner to add the extra explosion needed to get the van going.

I can here a vibrating noise when the pump first initializes but never more then 52 psi when I heard it make a stronger noise like a pump vibrating it was at 59 PSI and started every time without fail, but that soon ended and I was back to 52 PSI at key on and idle.

When I drive the van with the fuel pressure gauge attached to read, it is vibrating so fast back and forth it is not a steady enough to read like at idle. In the 50's

SO what am I missing?

Ps I did clamp both lines But I am not sure I clamped hard enough to stop a 50psi pressure to not leak by. Engine hot it took 20 minutes to leak down 8 psi engine cold (but clamps were removed over night then attiached for the cold test) it dropped 8psi and more a lot faster again I am not sure it was clamped tight enough.

Back to when the engine was hot, tested and it only dropped 8psi in 20 minutes or so then I removed the clamps it plummeted to 10 psi. Sadly I did not check with return line removed first or fuel line removed first I removed both clamps and it read 10 psi

Well here you go all week it has started. The pressure builds to 60-62 start car, it fires up. Psi is 54 while running.

I have to tell you though I am a bit tired of looking at the engine and the psi gauge hanging from the Fan speed switch (laughing)

It is not too bad at first but once the engine warms up it does get warm in the cabin.

With both front and rear a/c running it is bearable.

So the jury is still out

Could the SEAFOAM gas treatment have cured the situation?

I am still leery of filling the tank. If I have to drop it, it will be a whole lot easier empty. My last 3 fill ups have been 2 gallons only :)

Well I believe we have closure literally.

Since the seafom was added to the tank and within a few days. The van would reach all normal PSI's as mentioned.

I closed up the cover today, after 3 weeks of hearing the engine and feeling the heat.

I started the van Thanksgiving morning and it ran for 30 seconds turned it off.
Checked it Friday AM it still had 10-14 PSI

So either the check valve in the fuel pump had shellacked and the sea foam cleaned it or the regulator was gummy and the sea foam fixed it.

All I know is; it is working and starting on its own.

I also bravely put a full tank of gas in her today. Better yet it was $2.97 We have not seen under $3.00 for years.

Thanks for the support.