73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: hondaman on March 26, 2014, 10:57:41 pm
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I think my fuel pressure may be high. Will this GM TBI Fuel Pressure Tester thread into my quadrajet? http://www.actron.com/product_detail.php?pid=16175 (http://www.actron.com/product_detail.php?pid=16175)
The rigid line going from the fuel pump to the carb is already difficult enough to thread in all by itself. Adding an adapter... I dunno if that will work.
If not, what pressure tester should I use?
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I am assuming that the link you provided is for TBI testing so your truck is a 87 ?
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I am assuming that the link you provided is for TBI testing so your truck is a 87 ?
No, I'm sorry. I should have said in my post that it's an 81 with a quadrajet.
The one I linked said "GM" in the name, so I figured the fittings might work. But I'm wondering how it would fit with the rigid gas line being so.. rigid and uncooperative.
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My first question then should be does your mechanical fuel pump have a return line going back to the fuel tank ? It should not, but I have to ask because some models of fuel pumps have them.
I do believe the link you provided for the Actron fuel pressure checker is one that you have to disconnect the line from the carb. and hook straight into the tester, which means you will need to feed gas to keep your truck running.
Let my give you this link to Quadrajet Fuel Pressure Tech (http://quadrajetparts.com/quadrajet-fuel-pressure-tech-t-6.html), its an article on what you want to do and what pressures you should be trying to hit.
This is my suggestion for you, get a cheap inline fuel pressure tester, get a rubber fuel line hose and fittings to replace your hard line, do your test and solve any issues you might want to, then replace the rubber hose set up with your hard line and you will be set. Depending on the ends you have on the hard line (male vrs female and such), you should be able to take your hard line with you and match up what fittings you need to use the rubber fuel line.
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If you still have all hard line from the pump to the Qjet, its harder to insert a fuel pressure gauge. The PO of my truck had cut the hard line and inserted an external filter, so I just added a brass T-fitting in the rubber line and connected up a standard vacuum/fuel pressure tester I bought at the parts store (cheap).
I was troubleshooting acceleration problems so I ran a long rubber line to the gauge and duct taped the gauge to my windshield where I could see it. I used worm clamps on the lines to make sure nothing would come apart while driving. It looked a little strange, but worked very well to troubleshoot fuel pressure while I was driving.
Bruce