Hooking fuel pressure gauge
Question
You may have a faulty throttle position sensor. Bill
I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
Get one with a hose and an adapter to fit a Schrader valve. It would be nice if there was an electrical sender that screwed on to the schrader valve.
Response
I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
Ryan, Get one with a hose and an adapter to fit a Schrader valve. The valve is on the fuel rail, looks just like a tire valve. Pass the hose through the back of the hood over the fat hood gasket and duct tape the gauge to the windshield. Pressure should remain constant regardless of engine speed or load. Dean I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
Dean, Wasn’t the TBI fuel injection system still being used on GM trucks until 1995? I don’t see many with the 454, but I know that the other engines were using TBI. The problem now is that it is somewhat more challenging to tap into the TBI fuel system, because there is not a Schrader valve to the best of my knowledge. Ryan, There is a fuel pressure gauge made for TBI diagnostics, and it is made up of two fittings and hoses with a tee. The gauge “assembly” is installed in-line, either at the fuel filter or at the TBI unit. For your purposes, installation at the TBI unit is the way to go. I suggest that you have a new fuel supply line o-ring on hand, since the original one may not seal upon reuse. They are made to withstand the gasoline, so don’t substitue a regular o-ring made for oil or A/C systems. The fuel o-rings are available at GM dealers. The return and inlet are not the same size. Bear in mind that TBI is a low-pressure system in the GM vehicles. A correct gauge will have a scale of 0 to 15 psi, so that the scale is more expanded and easier to note fluctuations. A high-quality TBI gauge set is available from OTC tools as part number 7873 for about $130. It includes gauge set 7874 and GM fittings for 1982 to present TBI. No, it is not really cheap, but it is well made. I’ve used the Kent-Moore version many times for TBI fuel pressure diagnostics. Good Luck, Nick
Ryan, Get one with a hose and an adapter to fit a Schrader valve. The valve is on the fuel rail, looks just like a tire valve. Pass the hose through the back of the hood over the fat hood gasket and duct tape the gauge to the windshield. Pressure should remain constant regardless of engine speed or load. Dean I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
Nick, You are correct. I even have a ‘95 454 TBI and should have known better! Thanks for setting the record straight! Ryan, you should see 9-13 psi. Dean Dean, Wasn’t the TBI fuel injection system still being used on GM trucks until 1995? I don’t see many with the 454, but I know that the other engines were using TBI. The problem now is that it is somewhat more challenging to tap into the TBI fuel system, because there is not a Schrader valve to the best of my knowledge. Ryan, There is a fuel pressure gauge made for TBI diagnostics, and it is made up of two fittings and hoses with a tee. The gauge “assembly” is installed in-line, either at the fuel filter or at the TBI unit. For your purposes, installation at the TBI unit is the way to go. I suggest that you have a new fuel supply line o-ring on hand, since the original one may not seal upon reuse. They are made to withstand the gasoline, so don’t substitue a regular o-ring made for oil or A/C systems. The fuel o-rings are available at GM dealers. The return and inlet are not the same size. Bear in mind that TBI is a low-pressure system in the GM vehicles. A correct gauge will have a scale of 0 to 15 psi, so that the scale is more expanded and easier to note fluctuations. A high-quality TBI gauge set is available from OTC tools as part number 7873 for about $130. It includes gauge set 7874 and GM fittings for 1982 to present TBI. No, it is not really cheap, but it is well made. I’ve used the Kent-Moore version many times for TBI fuel pressure diagnostics. Good Luck, Nick Ryan, Get one with a hose and an adapter to fit a Schrader valve. The valve is on the fuel rail, looks just like a tire valve. Pass the hose through the back of the hood over the fat hood gasket and duct tape the gauge to the windshield. Pressure should remain constant regardless of engine speed or load. Dean I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
You may have a faulty throttle position sensor. Bill
I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
Get one with a hose and an adapter to fit a Schrader valve. It would be nice if there was an electrical sender that screwed on to the schrader valve.
Response
Ryan, Get one with a hose and an adapter to fit a Schrader valve. The valve is on the fuel rail, looks just like a tire valve. Pass the hose through the back of the hood over the fat hood gasket and duct tape the gauge to the windshield. Pressure should remain constant regardless of engine speed or load. Dean I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
I have a ‘93 Chevrolet Silverado with a 454 and auto tranny. I want to hook up a fuel pressure gauge when I am pulling a trailer and see what it looks like, is this possible? The reason I want to do this is because when I am pulling hard I have the pedal down and when I seem to let up a bit, there seems to be more power there. What would be causing this? Just replaced the fuel pump and filter. Also plugs and wires and gone through the distributor. Any suggestions?? Thanks for your help!!! Ryan
Response
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